What Does Focal Length Actually Do to a Photograph?

Changing focal length can change the apparent shape of the world.

Ask somebody what different camera lenses do and you will often get a perfectly reasonable answer:

“A wide-angle lens gets more into the picture, while a telephoto lens makes distant things look bigger.”

That is true.

But it misses one of the most interesting aspects of photography.

Change the focal length, change where you stand, and suddenly the relationship between the subject and the world around them appears to change as well.

A face can look broader or narrower. A nose can appear more prominent. A building behind somebody can seem tiny and distant in one photograph, then enormous and almost immediately behind them in another.

The background can apparently rush towards the subject.

Yet nothing in the scene has actually moved.

This is one of the reasons photography becomes much more interesting once we stop thinking only in terms of “zooming in” and begin thinking about perspective, working distance and composition.

Focal Length First: What Are We Actually Measuring?

The focal length of a lens is normally given in millimetres.

You might therefore have lenses marked:

24 mm

35 mm

50 mm

85 mm

100 mm

200 mm

or perhaps a zoom lens labelled:

24-105 mm

The number is not a direct measure of magnification in the way that “10x” on a pair of binoculars might be.

Instead, focal length is one of the main factors determining the angle of view recorded by the camera.

A shorter focal length gives a wider angle of view.

A longer focal length gives a narrower angle of view.

So, on the same camera:

• 24 mm shows a relatively wide area;

• 50 mm gives a more restricted view;

• 100 mm gives a narrower view still;

• 200 mm selects a comparatively small portion of the scene.

That part is fairly straightforward.

The interesting part begins when we try to photograph the same subject at the same apparent size using all four focal lengths.

Try This Simple Photography Experiment

This is an excellent experiment because it needs very little equipment.

You need:

• a camera with a zoom lens or several lenses;

• a cooperative person;

• a background containing recognisable objects;

• enough space to move backwards;

• ideally a tripod, although it is not essential.

Choose somewhere where the background contains obvious features.

For example, photograph somebody with:

• a building behind them;

• trees at different distances;

• a fence;

• a row of parked cars;

• lampposts;

• or perhaps a path disappearing into the distance.

Now take four photographs.

Use approximately:

24 mm

50 mm

100 mm

200 mm

But there is an important condition.

Keep the person's face approximately the same size in every photograph.

To achieve this you will have to move.

At 24 mm, you will need to be comparatively close.

At 50 mm, step backwards.

At 100 mm, move considerably farther away.

At 200 mm, you may need to be a surprisingly long way from your subject.

Then compare the four photographs side by side.

The differences can be remarkable.

The Wide-Angle Photograph

At 24 mm you may need to stand quite close to your subject.

The face fills the frame, but because the camera is physically close, there is a large difference between the distance from the camera to the person's nose and the distance to their ears.

That difference matters.

Objects nearer the camera appear proportionally larger than objects farther away.

The result can be a portrait in which:

• the nose appears relatively large;

• the ears seem smaller;

• the face appears stretched towards the camera;

• nearby hands can look enormous;

• the background appears relatively small and distant.

It is why putting a wide-angle camera very close to somebody's face can produce a deliberately exaggerated or even comic result.

The lens has not physically distorted the person.

Instead, the close camera position has exaggerated the perspective.

This is an important distinction.

The 50 mm Photograph

Move backwards and switch to around 50 mm.

Now the face can be kept roughly the same size in the frame, but the camera is farther away.

The difference in distance between the nose, eyes and ears is now a much smaller proportion of the total camera-to-subject distance.

Facial proportions therefore appear less exaggerated.

At the same time, the background appears larger relative to the subject than it did in the 24 mm photograph.

We are beginning to see something photographers often describe as compression.

The 100 mm Portrait

Move farther back again and use 100 mm.

The person's head can still occupy approximately the same amount of the photograph, but their appearance may now be noticeably different from the 24 mm version.

Facial features often appear flatter and more natural.

The background seems closer.

That building which looked a long way behind the person at 24 mm may now seem much more substantial.

Trees may seem packed closer together.

A distant hill can become an important part of the photograph rather than a tiny detail.

This is one reason focal lengths around the short-telephoto range are so popular for traditional portraits.

They allow a comfortable working distance and can make it easier to isolate a subject from the environment.

And Then Try 200 mm

At 200 mm you may need to stand a considerable distance away.

Again, frame the person's face at approximately the same size.

Now look at the background.

It may appear dramatically larger.

A distant building can look almost as though it is directly behind the person.

A line of trees may appear crowded together.

Layers in the landscape that were visually separated in the wide-angle photograph can seem stacked on top of one another.

This is often called telephoto compression.

But there is an important piece of photographic physics hiding behind that phrase.

Does a Telephoto Lens Actually Compress Perspective?

Strictly speaking, the lens itself is not doing the perspective compression.

Camera position determines perspective.

That is worth repeating:

Camera position determines perspective. Focal length determines how much of that perspective is included in the frame.

Suppose I take a photograph with a 24 mm lens while standing 10 metres away.

I then take another photograph from exactly the same position with a 200 mm lens.

The perspective relationship between all the objects is unchanged.

The 200 mm image simply records a much smaller part of the scene.

If the 24 mm image had enough resolution and I cropped a small section from its centre so that it matched the 200 mm image, the perspective would essentially be the same.

So why do telephoto pictures look compressed?

Because in normal photography we do not remain in the same position.

We move backwards to keep the subject the same size.

That increased camera-to-subject distance changes the perspective.

The long lens then allows us to fill the frame from that distant camera position.

That combination creates the familiar compressed appearance.

Working Distance Changes the Photograph

This introduces another concept that is often overlooked:

working distance.

Imagine photographing someone's head and shoulders.

With a 24 mm lens you might be almost uncomfortably close.

With a 50 mm lens you can step back.

With a 100 mm lens you can move farther away.

With a 200 mm lens you could be photographing from across a garden, hall or playing field.

That changes more than geometry.

It can also change how the subject behaves.

A camera only a metre from somebody's face can feel intrusive.

Move several metres away with a longer lens and they may relax.

That can matter enormously in portraiture, events, weddings and documentary photography.

The technically correct lens is not always simply the one which produces the required framing.

The photographer's physical relationship with the subject matters too.

Focal Length Also Controls How Much Background You Include

Suppose I photograph somebody outdoors.

With a wide-angle lens I may include:

• the person;

• the building beside them;

• the sky;

• the pavement;

• nearby trees;

• perhaps several other people.

The photograph tells us something about the person within their environment.

Use a longer lens and step backwards to preserve the same subject size and much of that surroundings disappears.

Perhaps we now see only:

• the subject;

• a small area of foliage behind them.

The photograph has changed from an environmental portrait into something much more concentrated on the individual.

Neither is automatically better.

They are simply telling different stories.

This Is Why Lens Choice Is Really a Compositional Decision

Photographers sometimes ask:

“What focal length should I use for a portrait?”

There is no single answer.

Instead, ask:

What relationship do I want between the subject and the background?

If the surroundings matter, a wider lens may be ideal.

A photograph of a scientist in a laboratory might deliberately include the equipment.

A musician at an organ might be photographed widely enough to show the instrument as well as the player.

A sailor might be shown with the boat and river around them.

Those details are part of the story.

For a tightly controlled portrait, however, we might deliberately remove much of that context.

Then a longer focal length can be extremely useful.

Wide Angle Can Create Depth

Wide-angle photography can make a picture feel extremely three-dimensional.

Place something close to the camera and allow the scene to stretch away into the background.

You could photograph:

• a path leading towards a building;

• the bow of a boat pointing along a river;

• laboratory equipment in the foreground with a student behind it;

• a musical keyboard stretching towards the organist;

• a table of products leading towards a person working behind them.

Objects near the camera become prominent.

Objects farther away diminish rapidly.

The photograph gains a powerful sense of depth.

This is one of the creative strengths of wide-angle photography.

Telephoto Can Simplify a Scene

Long lenses tend to do something very different.

They allow us to select a small portion of the world.

That can turn a chaotic scene into an orderly composition.

Imagine a street containing:

cars,

road signs,

people,

shops,

bins,

lamp posts,

and advertising.

A wide lens may capture all of it.

With a 200 mm lens, perhaps you can isolate one person against one attractive part of a building.

The photographer is no longer merely recording what is there.

They are selecting relationships from the scene.

Try the Experiment Again With Objects

The portrait experiment is useful, but you can go further.

Place three objects at different distances.

For example:

• a camera on a table;

• another object two metres behind it;

• a third object another few metres away.

Photograph them with a wide lens from close range.

Then move backwards, increase the focal length and keep the nearest object approximately the same size.

Compare the apparent spacing between the three objects.

At the longer focal length they will appear much closer together.

Once again, they have not moved.

What has changed is the camera position from which we are viewing them.

Try It With a Landscape

The effect can be even more dramatic outdoors.

Find a viewpoint containing perhaps:

• a tree;

• houses;

• distant hills.

Photograph the tree with a wide lens while standing reasonably close.

The hills may appear tiny.

Now walk backwards considerably and use a telephoto lens so that the tree again occupies roughly the same height in the frame.

Suddenly the hills can become enormous.

This is one of the reasons spectacular landscape photographs sometimes show a giant-looking moon, mountain or distant building behind a person.

The photographer is often a long way from the foreground subject and is using a long focal length.

What About Portrait Distortion?

You will sometimes hear statements such as:

“Never photograph faces with a 24 mm lens.”

That is too simplistic.

You certainly can photograph a portrait with 24 mm.

The question is how close you stand.

A close headshot at 24 mm may produce exaggerated facial perspective.

But an environmental portrait taken from farther away can look excellent.

Similarly, a 200 mm lens does not somehow possess a magical ability to flatter faces.

It simply enables the photographer to make a tightly framed portrait while remaining farther from the subject.

Again:

distance controls perspective.

Sensor Size Matters Too

There is another complication.

A 50 mm lens does not necessarily give the same field of view on every camera.

On a full-frame camera, 50 mm gives the familiar “normal” sort of view.

On a smaller APS-C sensor, the same 50 mm lens records a narrower field of view.

That is why photographers often talk about equivalent focal length or crop factor.

For example, a 50 mm lens on a camera with approximately a 1.6x crop factor gives roughly the same field of view as:

50 x 1.6 = 80 mm

on a full-frame camera.

The physical focal length has not changed.

The smaller sensor is simply recording a smaller central portion of the image projected by the lens.

This is worth remembering whenever photographers compare focal lengths.

Depth of Field Enters the Picture Too

Changing focal length and working distance can also affect how the background appears in focus.

Longer lenses are often associated with beautifully blurred backgrounds.

But once again several variables are interacting:

• focal length;

• aperture;

• subject distance;

• background distance;

• sensor size;

• framing.

If you photograph a person at 200 mm with a reasonably wide aperture and a distant background, separating the person from the background can become extremely easy.

This can give the familiar portrait look in which the eyes are sharp while the background becomes a soft wash of colour.

But background blur should not be confused with perspective compression.

They are related to different optical effects.

A Very Useful Four-Photograph Exercise

If you are learning photography, I would strongly recommend producing one simple comparison.

Take the same subject at:

24 mm

Move close enough to frame the head and shoulders.

Then:

50 mm

Move backwards until the framing matches.

Then:

100 mm

Move backwards again.

Finally:

200 mm

Move much farther away and match the framing once more.

Put the four images beside one another.

Now study:

1. the shape of the face;

2. the apparent size of the nose;

3. the visibility of the ears;

4. the amount of background included;

5. the apparent size of distant objects;

6. the apparent distance between foreground and background;

7. how blurred the background appears;

8. how comfortable the working distance felt.

You can learn more from those four photographs than from memorising a list of recommended focal lengths.

Then Perform the Control Experiment

There is one further experiment which makes the idea particularly clear.

Put the camera on a tripod.

Take one photograph at 24 mm.

Do not move the camera.

Change to 50 mm and photograph again.

Then 100 mm.

Then 200 mm.

The photographs become progressively tighter, but compare objects that appear in all four frames.

Their perspective relationship does not change.

That demonstrates the key idea beautifully.

Now repeat the first experiment, moving the camera backwards every time you increase the focal length.

This time the perspective changes dramatically.

The difference between those two experiments explains a great deal about how lenses actually influence photographs.

Stop Asking Which Lens Is “Best”

One of the biggest changes in my own approach to photography has been to stop thinking of lenses simply as different amounts of magnification.

The more useful question is:

Where do I want to stand?

From that follows another question:

What focal length will give me the composition I want from that position?

That reverses the normal beginner's thought process.

Instead of standing somewhere and zooming until the subject fills the frame, deliberately choose the viewpoint first.

Move around.

Walk closer.

Walk farther away.

Look at how foreground and background objects change in relation to one another.

Then select the focal length that gives the required framing.

That is when focal length becomes a creative tool rather than simply a number written on a lens barrel.

The Same World — Four Completely Different Photographs

A 24 mm lens, a 50 mm lens, a 100 mm lens and a 200 mm lens can all photograph exactly the same person.

They can even produce photographs in which that person's face occupies almost exactly the same area of the frame.

Yet the photographs can look strikingly different.

The wide-angle version may emphasise depth and surroundings.

The standard lens may give a natural balance between subject and environment.

The short telephoto can simplify the composition and produce a pleasing portrait.

The 200 mm lens can apparently pull the distant background towards the subject.

The world has not changed.

The relationship between the photographer, subject and background has.

And that leads to perhaps the most useful lesson of all:

Focal length does much more than decide how much fits into the photograph. It determines which camera positions become practical — and camera position determines how the three-dimensional world is translated into a two-dimensional image.

Once you understand that, choosing a lens stops being simply a technical decision.

It becomes part of the way you tell the story.

#Photography #PhotographyTips #PhotographyEducation #FocalLength #CameraLenses #WideAngle #Telephoto #PortraitPhotography #PhotographyExperiment #LearnPhotography #PhotographyTechniques #CreativePhotography #PhilipMRussellLtd

 

Trying Airteq on the Wersi Pergamon – Designing My Own Pipe Organ

The most interesting question Airteq has given me is not, “Which organ stop shall I use?” It is, “What sort of pipe would I like to invent?”

Over the past few days I have been experimenting with Airteq from MODARTT on my Wersi OAX 1000 Pergamon, and I have a feeling this may develop into a much bigger project than simply installing another software instrument.

I already use Organteq, also from MODARTT, and I think it is excellent. Organteq approaches the pipe organ through physical modelling rather than relying on recordings of individual notes. The sounds are generated in real time, with the model taking account of such things as the behaviour of the air jet, pipe resonance, attack characteristics and other aspects of real organ pipes.

Airteq starts from some of that same underlying world of air, pipes and resonance, but goes in a rather different direction.

MODARTT describes it as a physically modelled sound-design instrument rather than an attempt simply to imitate another existing instrument. Its model is rooted in organ-pipe physics but has been developed to allow much greater control over the air feeding the virtual pipes—what MODARTT calls Dynamic Aerophone Modeling.

That changes the way I find myself thinking about it.

With a conventional organ, I might ask:

Which stop should I select?

With Airteq, I can begin asking:

What happens if I change the pipe itself?

And that is where things become fascinating.

From Organist to Organ Builder

Most organists spend their time working with an instrument somebody else has designed.

An organ builder has already decided:

• what pipes will be fitted;
• their dimensions;
• their construction;
• their voicing;
• how much wind they receive;
• how the different ranks relate to one another;
• and ultimately what character the finished instrument will have.

The organist then combines those available stops to produce different registrations.

That alone can provide an almost endless range of possibilities.

But Airteq introduces another level.

Instead of merely selecting from the pipes provided by the organ builder, I can begin experimenting with the virtual equivalent of the pipe construction itself.

That turns the exercise from registration into something closer to instrument design.

I may begin with something recognisable.

Then change a parameter.

Play it.

Listen.

Change something else.

Play it again.

And suddenly the sound may begin to move away from the familiar organ stop I started with.

The important point is that I am not simply applying an audio effect to a recording.

The sound itself is being generated from the model.

What Does Physical Modelling Actually Mean?

This distinction is important.

Many virtual instruments are based on samples.

Somebody records a real instrument, often extremely carefully, note by note and sometimes at several different dynamics. When you press a key, the software plays the appropriate recording.

Modern sample libraries can sound spectacular.

But fundamentally, you are replaying something that was previously recorded.

Physical modelling takes another approach.

Instead of storing the sound, the computer stores a mathematical model describing aspects of the physical system that creates the sound.

For an organ pipe, that means modelling behaviour associated with air flow, excitation and resonance.

MODARTT's explanation of its organ modelling describes a pipe as a self-sustaining acoustic system. Air supplies energy; the air jet or reed provides excitation; the pipe acts as a resonator; and the interaction develops into the sound we recognise as an organ pipe.

So when I press a key, the computer is effectively calculating what its virtual pipe should do.

That also means that changing the virtual construction can change the resulting sound.

And that is exactly the part I find interesting.

A Virtual Pipe Does Not Have to Obey the Organ Builder's Workshop

A real organ builder has some rather significant restrictions.

A pipe must actually be possible to manufacture.

It has to fit inside the organ.

It needs a practical wind supply.

Materials cost money.

Thousands of pipes occupy enormous amounts of space.

Someone has to voice them.

Someone eventually has to maintain them.

And if an experimental pipe turns out to sound dreadful, replacing an entire rank is rather more complicated than clicking Undo.

A virtual organ does not have quite the same constraints.

That means experimentation becomes much easier.

I can alter something simply to discover what happens.

Perhaps I produce a beautiful new sound.

Perhaps I produce something completely unusable.

Both results are useful.

One gives me a possible new stop.

The other teaches me something about how the model behaves.

Sometimes the Wrong Sound Is the Most Interesting Sound

This is one of the things I enjoy about experimentation in general.

If you already know exactly what result you want, you tend to change parameters until you obtain it.

But if you are exploring, something apparently going wrong can be much more interesting.

Suppose I am trying to make a gentle flute-like sound.

I alter a parameter too far.

Instead of becoming softer, the sound develops an unexpected breathy or unstable quality.

My first reaction might be:

That isn't what I wanted.

But then I play something different with it.

Perhaps it works wonderfully as a slow background texture.

So the question changes.

Instead of:

How do I fix this?

it becomes:

What could I use this for?

That is the difference between reproducing an existing instrument and exploring a sound-design environment.

Organteq and Airteq – Similar Foundations, Different Destinations

It would be easy to assume that Airteq is simply another version of Organteq.

I do not think that is the most useful way of looking at it.

Organteq starts with the pipe organ.

Its purpose is very much connected with constructing and playing virtual pipe organs. It provides extensive control over the organ composition and allows individual stops and even individual pipes to be adjusted. MODARTT's current Organteq system includes thousands of modelled pipes and extensive voicing controls.

Airteq starts with the physics and asks where else they might lead.

MODARTT explicitly describes Airteq as being about exploration rather than imitation.

That can lead towards recognisable organ sounds.

But it can also take you towards:

• evolving pads;
• airy textures;
• cinematic sounds;
• rhythmic pulses;
• strange hybrid sounds;
• atmospheric backgrounds;
• and sounds that are difficult to put into any traditional instrumental category.

MODARTT launched Airteq on 15 September 2026 with more than 170 presets intended to demonstrate this range.

For me, however, the presets are really the beginning rather than the destination.

Presets Are Examples, Not Answers

More than 170 presets give you plenty to explore.

They are particularly useful when learning an unfamiliar instrument because they show you what is possible.

I can select one.

Play it.

Then ask:

How did they create that?

I can alter it.

Save another variation.

Alter that again.

Soon I am no longer simply browsing factory sounds.

I am learning how the instrument responds.

There is an important lesson here that applies to synthesisers generally.

A preset can be used in two ways.

The first is:

I like that sound. I will use it.

The second is:

I like something about that sound. I wonder what happens if I change it.

The second approach is much more interesting to me.

The Instruction Manual Cannot Tell You What You Want to Invent

At the moment, I would describe the available guidance as rather limited compared with the number of possibilities presented by the instrument.

Initially that can feel slightly intimidating.

There are controls.

There are parameters.

There are unfamiliar relationships between them.

And there isn't necessarily a tutorial saying:

Turn this control to exactly 37% and you will produce a perfect new organ stop.

I am beginning to think that may actually be part of the attraction.

Perhaps the best Airteq tutorial starts with four instructions:

Change something.

Play something.

Listen carefully.

Change it again.

That process is far more educational than blindly copying settings from somebody else.

You begin developing an understanding of cause and effect.

A Practical Experiment: Designing One Stop

One of the projects I want to try is deliberately simple.

Rather than attempting to build an entire organ immediately, start with one stop.

Begin with a broadly familiar pipe character.

Play a short passage repeatedly so that I have a constant musical reference.

Then change only one significant parameter at a time.

Listen particularly to:

• the attack;
• brightness;
• harmonic richness;
• breathiness;
• stability;
• response to different notes;
• response across the keyboard;
• behaviour as the sound develops;
• and whether it blends with another stop.

If I find something interesting, save it.

Then continue.

Eventually I could end up with several related sounds:

Experimental Flute 1

Experimental Flute 2

Experimental Flute – Airy

Experimental Flute – Dark

Experimental Flute – Solo

The names do not particularly matter.

What matters is that I begin building a personal library rather than simply selecting somebody else's.

Then Try to Break the Rules

Once I understand what produces a plausible conventional stop, the next experiment becomes more interesting.

Deliberately move beyond it.

What happens if I make the attack unusually pronounced?

What happens if the airflow behaves differently?

What happens if I push a parameter far beyond the point where a traditional organ builder might consider the result desirable?

Can I create something that begins like a pipe organ but develops into a pad?

Can I make something that works beneath strings?

Could I produce an atmospheric sound for film music?

Could I create a solo voice that sounds vaguely familiar but cannot quite be identified?

These are no longer purely questions about organ registration.

They become questions about sound design.

The Pergamon Makes This Particularly Interesting

This is where installing Airteq on the Wersi OAX 1000 Pergamon becomes particularly attractive.

The Pergamon is already an enormous sound platform.

The OAX system provides organ sounds, orchestral sounds, synthesis, accompaniment facilities, MIDI, audio and extensive performance controls. Wersi describes the OAX instruments, including the Pergamon OAX1000, as sharing the same core range of sounds and functions across the OAX family.

So Airteq does not have to operate in isolation.

A sound I design can potentially become one component of something much larger.

For example, I might combine:

• an Airteq pipe-based texture;
• a Wersi string sound;
• another orchestral voice;
• a conventional organ registration;
• and perhaps another software instrument.

That creates another question:

What happens when an instrument I have designed myself becomes part of a larger registration?

That is much more exciting than simply adding another preset to a list.

Building My Own Virtual Pipe Organ

The longer-term project I am considering is more ambitious.

Rather than trying to reproduce a particular cathedral organ, church organ or theatre organ, I would like to try constructing an original virtual organ for the Pergamon.

Not a copy.

Not:

"Here is my virtual version of Organ X."

Instead:

"Here is an organ that exists only because I decided what it should sound like."

That would mean gradually designing its identity.

Perhaps it could have several divisions.

Great

Strong principal choruses, foundation sounds and brighter ensemble voices.

Swell

More expressive sounds, strings, flutes, reeds and atmospheric colours.

Choir or Positive

Smaller, clearer or more intimate voices.

Solo

Distinctive sounds deliberately designed to stand away from the rest of the instrument.

Pedal

Enough foundation to support everything else, together with a few more unusual possibilities.

But there is absolutely no reason I have to stop there.

Why not add an:

Atmospheric Division

A set of sounds derived from pipe physics but designed specifically for pads, cinematic textures and slow-moving backgrounds?

Or perhaps:

Experimental Division

The sounds that traditional organ builders would probably never build.

That is where Airteq could become especially interesting.

Designing an Organ With a Character

A real pipe organ is much more than a collection of individual stops.

A great organ has a character.

Its stops belong together.

A flute may sound beautiful on its own, but it also needs to blend appropriately with other parts of the instrument.

So creating a virtual organ raises some fascinating design questions.

Should every stop be individually spectacular?

Probably not.

Some of the most useful organ stops are valuable precisely because they support other sounds.

How should the Principal blend with the Octave?

How powerful should the reeds be?

How quickly should the ensemble become bright?

Which sounds should dominate?

Which should disappear gently into the registration?

At what point does a collection of separate sounds become one instrument?

That could turn this into a substantial project.

Why the Pergamon Is Becoming More Than an Organ

This also connects with something I find increasingly interesting about the Pergamon.

A modern electronic organ does not have to be treated simply as an electronic imitation of an older instrument.

It can be a control surface.

A performance instrument.

A MIDI system.

A synthesiser platform.

A software-instrument host.

A compositional tool.

A sound laboratory.

And, increasingly in my case, an experimental musical workstation.

I recently replaced the conventional music-rest arrangement with a large screen and moved much of my music library into digital form.

Now I am experimenting with physically modelled instruments.

The instrument continues changing because I keep finding different things I want it to do.

That is probably one of the reasons I enjoy this technology so much.

There Is Also Quite a Lot of Science Hiding Inside the Music

Airteq appeals to another side of my interests as well.

A pipe organ is an extraordinary combination of music, engineering and physics.

Questions about pipe dimensions lead immediately into resonance.

Airflow leads into fluid dynamics.

Pipe shape influences the harmonic spectrum.

Enclosures influence radiation and acoustics.

Multiple pipes introduce tuning and interference.

The building itself becomes part of the instrument.

MODARTT's modelling work explicitly deals with such phenomena as aero-acoustics, pipe resonances, sound radiation and room acoustics.

So experimenting with a virtual pipe is also, indirectly, experimenting with a model of physics.

That makes the process even more appealing to me.

Could I Design a Stop No Real Organ Has Ever Had?

This is probably the question I am most interested in answering.

There is little point having this sort of technology if I use all its flexibility merely to recreate exactly what already exists.

Of course I want convincing Principals, Flutes, Strings and Reeds.

They provide a musical reference point.

But eventually I want to move beyond them.

Suppose a sound has the recognisable attack of an organ pipe but develops into something completely unexpected.

Suppose it behaves like an acoustic instrument but occupies a musical space that no acoustic instrument occupies.

Suppose it works beautifully alongside conventional organ stops despite being something that could never realistically be constructed from metal, wood and leather.

What would I call it?

Perhaps that is when I will know that the experiment has really worked.

The First Rule: Save Everything Interesting

There is one very practical lesson I have already learned from working with synthesisers and sound design.

If you discover an interesting sound:

save it.

Do not assume you will remember exactly how you made it.

You won't.

Sometimes the best sounds come from a sequence of tiny changes that would be extremely difficult to reproduce later.

I therefore expect my Airteq library eventually to contain plenty of experimental versions.

Some will probably never be used again.

Others may become favourites.

That is simply part of the process.

What Comes Next?

I am still very much at the experimental stage.

I am not yet going to claim that I have built Philip Russell's Grand Virtual Organ.

At present I am learning.

Listening.

Altering parameters.

Creating variations.

Occasionally producing something wonderful.

Occasionally producing something that perhaps ought never to be heard again.

But that is what makes experimentation worthwhile.

The next stage will be to begin documenting some of the sounds properly and creating examples.

I would like to compare:

• the starting pipe model;
• one or two intermediate versions;
• and the final sound.

That should make it possible not only to hear the result but also to understand how the sound developed.

Eventually I would like to build complete groups of related stops and begin assembling them into divisions.

And after that?

Perhaps a completely original virtual pipe organ designed specifically around the Pergamon.

Conclusion – The Organist Can Now Become the Organ Builder

Traditional pipe organs represent centuries of extraordinary craftsmanship, acoustics and musical development. I have no desire to replace that tradition.

Quite the opposite.

Understanding something about how pipes work makes real organs even more fascinating.

But technologies such as physical modelling allow us to ask questions that previous generations simply could not explore so easily.

Instead of only asking:

Which stop shall I use?

I can ask:

What should my stop sound like?

Instead of only choosing a registration:

I can design one of the instruments that makes up that registration.

And instead of trying to reproduce somebody else's organ:

perhaps I can create one of my own.

That is why Airteq interests me.

Organteq gives me a remarkable physically modelled pipe organ.

Airteq seems to offer something slightly different.

The opportunity to become the organ builder as well as the organist.

And if some of my virtual pipes turn out to be things that no sensible traditional organ builder would ever have attempted to construct?

That may be where the most interesting sounds begin.

I will post some audio and video examples as the experiments develop.

 

What Should a Student Do When They Are Predicted a D but Need a B?

The route from a D to a B usually begins by finding out where the marks are actually disappearing.

Being predicted a D when you need a B can feel alarming.

Perhaps the B is needed for a university course. Perhaps it is part of a sixth-form requirement, an apprenticeship application or simply the grade a student believes they ought to be capable of achieving.

The understandable reaction is often:

"I need to revise much harder."

That may be true.

But it is not usually the best place to start.

If a student is currently performing at D grade, the first question should not be:

"How many more hours can I revise?"

It should be:

"Why am I currently losing enough marks to get a D?"

That distinction matters.

A student may be losing marks because they do not understand several major topics.

But they may also be losing marks because they:

• misread questions;

• forget definitions;

• cannot recall key formulae;

• abandon difficult questions too quickly;

• make basic algebraic mistakes;

• fail to show working;

• run out of time;

• write too little;

• write a great deal without answering the question;

• know the subject but cannot apply it to unfamiliar situations.

These are very different problems.

And they require very different solutions.

A Predicted Grade Is a Starting Point, Not a Diagnosis

A predicted grade tells us roughly where a student is performing.

It does not tell us why.

Two students might both receive a D in an examination while having completely different difficulties.

One might know most of the course reasonably well but lose enormous numbers of marks through poor examination technique.

Another might be excellent on half the syllabus but have serious gaps in the other half.

A third might understand material when it is explained but be unable to recall it independently a week later.

A fourth might know a surprising amount but work so slowly that they never reach the final quarter of the paper.

Writing D at the top of each of those students' papers tells me almost nothing about what I should teach them next.

That is why one of the first things I want to see when helping a student improve is not simply the grade.

I want to see the paper.

Where did the marks go?

That is much more useful.

Stop Thinking About Grades for a Moment

This sounds slightly strange when the entire objective is to improve a grade, but sometimes we need to stop thinking about grades and start thinking about marks.

Imagine that a particular examination requires approximately 50 marks for a D and approximately 70 marks for a B.

The exact boundaries will vary from year to year, of course, but the principle remains the same.

The problem is no longer:

"How do I turn a D-grade student into a B-grade student?"

It becomes:

"Where can we find another 20 marks?"

That is a much more useful question.

Perhaps five marks are being lost through weak definitions.

Perhaps another five disappear because the student does not show enough working in calculations.

Perhaps six could be recovered from two topics they have never properly understood.

Perhaps another four are disappearing because questions are being misread.

Suddenly the apparently enormous D-to-B leap begins to look like a collection of smaller, more manageable problems.

That is how I prefer to approach grade improvement.

Begin With a Proper Diagnostic Assessment

One of the least efficient things a struggling student can do is revise everything equally.

If you have ten weeks available, spending ten weeks going through the entire textbook from page one is unlikely to be the best strategy.

Some topics will already be secure.

Some will need a little polishing.

Others may represent major weaknesses.

The first job is therefore to construct a weak-topic map.

I often think of topics as falling into four broad groups.

Secure:
The student can answer straightforward and unfamiliar questions reliably.

Nearly secure:
The student understands the topic but makes occasional mistakes or struggles with harder applications.

Weak:
The student recognises the topic but cannot answer questions independently.

Missing:
The student has little usable understanding of the topic at all.

That map is far more valuable than simply saying:

"I'm not very good at Physics."

Or:

"I find Maths difficult."

Those statements are too vague to act upon.

Instead, we might discover:

"I am confident with simultaneous equations and quadratics, but I struggle with trigonometric graphs, vectors and probability."

Now we have something we can work with.

Not All Weak Topics Are Equally Important

Once weaknesses have been identified, they need to be prioritised.

Students sometimes make the mistake of spending enormous amounts of time on the hardest topic in the syllabus simply because it frightens them.

That may not be the best use of limited revision time.

Suppose a student could spend three hours mastering a topic that might contribute two marks to an examination.

Meanwhile, there are three moderately difficult topics worth perhaps six or eight marks each that could be improved relatively quickly.

The second option is probably the better investment.

That does not mean avoiding difficult material permanently.

It means thinking strategically.

When the target is moving from D towards B, I am often interested first in what I call recoverable marks.

These are marks the student could realistically begin collecting with focused work.

They may come from:

• common question types;

• key definitions;

• standard calculations;

• frequently assessed processes;

• graphs;

• data interpretation;

• straightforward application questions;

• required terminology;

• showing complete working.

A student does not necessarily need to become brilliant at everything before their grade begins to rise.

They need to become more reliable at collecting marks.

The Most Important Question: Knowledge or Application?

This is one of the biggest distinctions I make when working with students.

Does the student not know the material, or do they know it but fail to use it successfully in examination questions?

Consider an A-level Biology student.

They may be able to describe the process of natural selection perfectly when asked directly.

But present the idea through an unfamiliar example involving antibiotic resistance, pesticide resistance or changing environmental conditions and suddenly the answer becomes confused.

The problem is not simply missing knowledge.

It is application.

The same happens in Mathematics.

A student may be perfectly capable of differentiating:

y = 3x^3 + 4x^2 - 7x + 2

But give them a problem asking them to determine the maximum volume of a container, and suddenly they cannot see that differentiation is required.

Again, the problem is not necessarily technique.

It is recognising the technique inside an unfamiliar problem.

Physics produces the same difficulty.

A student may know:

v = u + at

but still struggle because they cannot decide whether that equation is appropriate for the situation described.

That is why simply reading notes repeatedly can give students a dangerously misleading impression of progress.

Recognition is not the same as recall.

Recall is not the same as application.

And application is what many examination questions actually test.

Use Examination Papers as Diagnostic Tools, Not Just Tests

Past papers are often treated as something students should save until immediately before the examination.

I think that wastes one of their most useful functions.

Past questions are diagnostic instruments.

They show us exactly what happens when knowledge has to be turned into marks.

Suppose a student attempts 20 questions.

Rather than simply adding up the score, I want to know why each lost mark disappeared.

Was it:

K — Knowledge missing?

U — Understanding weak?

A — Application problem?

R — Question misread?

M — Mathematical error?

T — Terminology inaccurate?

E — Examination technique?

C — Careless mistake?

After several papers, patterns begin to emerge.

That can be extraordinarily revealing.

A student convinced that they "don't know anything" may discover that knowledge is not actually their main problem.

Perhaps most of the lost marks are caused by interpretation and technique.

Equally, a student who believes they merely make "silly mistakes" may discover that there are genuine gaps in understanding that need addressing.

The evidence matters.

Do Not Confuse Revision With Learning

This distinction is particularly important for a student trying to make a significant grade improvement.

Highlighting notes is revision.

Reading a textbook is revision.

Watching a video can be revision.

But none of those activities guarantees learning.

The test is what happens when the support disappears.

Close the book.

Remove the video.

Turn the notes face down.

Now explain the idea.

Answer the question.

Draw the diagram.

Complete the calculation.

Define the term.

If you cannot do it without looking, it is not yet secure.

One practical technique I use with students is very simple.

After we have worked through a question together, I change the numbers or alter the context and ask them to do another one independently.

That immediately tells me whether they have understood the method or merely followed my explanation.

Fix Foundations Before Chasing the Hardest Questions

Students aiming for higher grades understandably want to practise high-grade questions.

That is useful — once the foundations are sufficiently reliable.

But trying to solve extremely difficult problems while routinely dropping straightforward marks can be counterproductive.

A student may spend 20 minutes wrestling with a challenging six-mark question while elsewhere in the paper they have lost:

one mark for a missing unit;

one mark for an incorrect definition;

two marks for not showing working;

one mark through a sign error;

one mark because they forgot to answer part (b).

That is six marks lost without encountering anything intellectually difficult.

This is why improving grades sometimes involves surprisingly unglamorous work.

We make basic procedures reliable.

We practise definitions.

We learn to identify what a question is asking.

We show working.

We check units.

We answer every part.

We learn when to move on.

Those habits accumulate marks.

Examination Technique Can Be Worth an Entire Grade Boundary

Students sometimes regard examination technique as something superficial.

It is not.

An examination is a particular form of communication.

The student has to demonstrate their knowledge in a way that allows an examiner to award marks.

A student might possess good subject knowledge and still underperform because they have not learned how to communicate it effectively under examination conditions.

For example, command words matter.

State does not require an essay.

Explain usually requires a chain of reasoning.

Calculate requires working.

Compare usually requires referring to both things being compared.

Evaluate normally requires a judgement supported by evidence.

Teaching students to respond properly to those instructions is not teaching them to "play the exam system".

It is teaching them to answer the question they have actually been asked.

Look at How Much Is Being Written — and Whether It Earns Marks

In essay-based subjects, one problem I frequently see is students equating quantity with quality.

They write extensively.

But the answer may contain repetition, description without analysis or material that does not address the question.

Writing another page does not necessarily earn another mark.

At the opposite extreme, some students know considerably more than their answer reveals because they write far too little.

The aim is not simply to write more or less.

It is to increase mark density.

How much of what is written is actually doing something useful?

A strong paragraph should have a purpose.

A calculation should have a logical progression.

A scientific explanation should connect cause and effect.

Again, the question becomes:

Where are the marks disappearing?

Create a Marks-Recovery Plan

Once the problems have been diagnosed, improvement becomes much more systematic.

Imagine a student needs approximately another 20 marks.

We might create a plan such as:

+5 marks: strengthen two weak high-frequency topics.

+4 marks: improve definitions and technical vocabulary.

+3 marks: show complete mathematical working.

+3 marks: improve data and graph interpretation.

+3 marks: reduce question-reading errors.

+2 marks: improve time management so the final questions are attempted.

Of course, nobody can guarantee those precise gains.

But thinking this way changes the psychology of the problem.

We are no longer waiting for the student somehow to "become a B-grade student".

We are systematically looking for marks.

Improvement Usually Comes in Steps

Parents and students understandably want to see quick evidence that tuition or revision is working.

But educational progress is rarely a smooth upward line.

A student might score:

54%

then 57%,

then 55%,

then 61%,

then 63%.

The temporary drop from 57% to 55% does not necessarily mean anything has gone wrong.

The second paper may simply have tested different material.

What matters is the trend and, even more importantly, the changing nature of the mistakes.

I am particularly interested when mistakes move from:

"I had no idea how to start this."

to:

"I knew how to do it but made an algebra mistake."

That may still result in a lost mark.

But educationally, it represents considerable progress.

The next stage is making the technique reliable.

Why Confidence Often Improves After Performance

We frequently hear that students need more confidence.

That is true.

But telling someone to "be more confident" is rarely useful.

Confidence often develops from evidence.

A student who repeatedly could not answer a particular type of question begins to solve it successfully.

Then they solve another.

Then they recognise it in a past paper.

Then they solve it under timed conditions.

Eventually the student begins to think:

"I can actually do this."

That confidence is valuable because it has been earned.

The student no longer needs to persuade themselves that they might succeed.

They have evidence that they can.

How Long Does It Take to Move From a D to a B?

There is no responsible answer that applies to everyone.

It depends on why the student currently has a D.

If a capable student has poor examination technique and several repairable gaps, improvement can sometimes happen relatively quickly.

If the student has substantial weaknesses stretching back several years, more rebuilding may be needed.

Other factors matter too:

• how much time remains before the examination;

• how regularly the student works;

• whether homework is completed;

• whether earlier knowledge is secure;

• how demanding the target examination is;

• how effectively independent study time is used.

The important point is to start early enough to allow a cycle of:

diagnose -> teach -> practise -> test -> analyse -> improve

and then repeat it.

That cycle is much more powerful than:

read everything -> panic -> do one past paper -> discover problems three days before the examination.

A Miraculous Revision Weekend Is Not a Strategy

Every year students hope that one heroic weekend of revision will transform months of inconsistent learning.

Occasionally someone does make remarkable short-term progress.

But it is not a sensible plan.

Moving from D to B normally comes from dozens of small improvements.

Learning three definitions today.

Fixing a misunderstanding tomorrow.

Completing ten algebra questions on Thursday.

Correcting them on Friday.

Attempting an examination question on Saturday.

Returning to it again the following week.

None of these activities appears dramatic.

Collectively, they can completely change an examination result.

What I Look for When Teaching a Student Who Needs to Improve

When I work with a student in this situation, I am not simply thinking:

"What topic shall we cover today?"

I am asking:

What is preventing this student from collecting marks?

Sometimes that means reteaching a topic from first principles.

Sometimes it means challenging the student with harder questions.

Sometimes we discover that they know far more than their school assessment suggests.

Sometimes we discover foundational weaknesses that need rebuilding.

Sometimes the biggest improvement comes from teaching them to slow down and read the question.

At other times, the student needs the opposite: they must learn when to stop struggling with one question and move on.

Effective tuition is therefore not just extra teaching time.

It should be diagnostic.

The lesson should respond to what the student actually needs.

Parents Can Help — Without Becoming the Teacher

Parents often ask what they can do.

One of the most useful things is to encourage consistency rather than panic.

Instead of asking:

"Have you revised?"

it may be more useful to ask:

"What did you practise today?"

Or:

"What can you do now that you couldn't do last week?"

Or:

"Which topic are you going to improve next?"

Those questions focus attention on progress and actions rather than simply hours spent at a desk.

A student who says they revised for three hours may have achieved very little.

A student who spent 40 focused minutes correcting a genuine weakness may have achieved far more.

From D to B Means Becoming More Reliable

There is one final point that is easy to miss.

Students sometimes imagine that a B-grade student knows completely different material from a D-grade student.

Sometimes they do.

But often the difference is reliability.

The stronger student:

gets more of the straightforward questions right;

makes fewer avoidable mistakes;

recognises familiar methods more quickly;

uses terminology more accurately;

shows enough working;

manages time more effectively;

and collects marks consistently across the paper.

That is encouraging because reliability can be trained.

The Real Question Is Not "Can I Get a B?"

A student predicted a D may look at a B and see an enormous gap.

I prefer to break that gap apart.

Which topics are weak?

Which mistakes repeat?

Which examination skills are missing?

Which marks are realistically recoverable?

What should we fix first?

What can the student practise independently?

How will we know whether it has worked?

Those are answerable questions.

And once those questions begin to be answered, something important happens.

The grade becomes less mysterious.

The student is no longer simply hoping for a B.

They are building one mark by mark.

The route from a D to a B rarely begins with working twice as many hours. It begins by discovering where the marks are disappearing — and then systematically getting them back.

Philip M Russell Ltd — Private Tuition, Hemel Hempstead and Online

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