New answers tagged subject-distance
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 http://www.scantips.com/lights/fieldofview.html The Field ...
That is just Field of View, see http://www.scantips.com/lights/fieldofview.html For a calculator, and if you know trig tangent, the diagram at page bottom will explain how.
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