There seems to often be just two ways of choosing a lens - this is the only one I have - I choose the focal length depending upon how wide an angle I want - But better is to choose on what distortion is acceptable. The wider the lens - usually the smaller the number the worse the distortion gets up to a point then after that as the image get more magnified the image again starts to get more distorted. It depends on what you want and what you are willing to accept. for the image you are creating. Sometimes it is this distortion that you want.
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