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1

There are several misnomers being used that confuse things... i.e. a telephoto lens is a lens design that has little to do with it's FOV; the same is true for a macro lens. But your idea of calculating/comparing the recorded FOV is valid in terms of determining if the lens used is wide/normal/narrow. Technically there are short focus lenses, and long focus ...


2

Macro is defined by magnification = (projected image size on the sensor) / (actual object size). Macro magnification is generally considered 1.0, but can be greater than 1.0 or slightly less than 1.0. Most decent quality macro lenses have flat field focus (handy for copy work) and very little distortion. Common focal lengths, with respect to 35mm sensors, ...


4

For valid reason, which I will explain later, the “normal” focal length for any size camera is a focal length that is approximately the same length as the diagonal measure of its format size. Additionally, the aspect ratio of most rectangular format cameras is 3÷2 = 1.5. In other words, the length is 1.5 times the height. If you mount a lens, focal length ...


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