Is my thinking about equivalence right?

Started 3 months ago | Questions thread
OP Muster Mark Contributing Member • Posts: 588
Re: Is my thinking about equivalence right?

A lot of words there to say "multiply focal length and aperture by same constant" as far as I can tell. Which I get. My reason for making this post is that no one seems to be interested in doing these calculations correctly (i.e. integrating illumination over the frame) and instead assume lenses are ideal and have no vignetting, which should be part of the total light calculation (instead of saying pupil area x sensor size).

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