Thinking about a camera as it is.

Using the 70-200mm lens. On the7D Camera which is an APS-C sensor this lens  with the 1.6x crop factor becomes a 112-320mm lens at f2.8, this makes the lens an exceptional telephoto. When buying these lenses I try not to think of them as for instance a 70-200 but instead as what they will be on this camera, so I think of this lens as my 100-300mm telephoto zoom.

Now I select the right lens for the right situation. I don't compare this lens and camera with a full frame  version but I think of it for what I have and it works fine.

Science Lessons by streaming. Using a Blackmagic ATEM mini to switvch between cameras and allowing picture in picture to engage the students. Now it is much easier to do online experiments moving the camera through the setup, then switching to a wide view, then a a flick of a switch to the paper or computer screen. I find four devices is just about right for one person to handle, allowing me to teach, and control the video and some graphic effects. Supported by Rode microphones and canon cameras and an Elmo visualizer we are making great progress.