Red and Blue

by Gordon

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Pretty much any lens can focus at infinity, so I think to make sense, the question must mean maximum distance so that the image of subject is a usable size instead of a dot. Which is going to be hard for anyone else to judge, but a Field Of View Calculator should answer for individual purposes. See The Field ...


That is just Field of View, see For a calculator, and if you know trig tangent, the diagram at page bottom will explain how.

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