clarification on focal distance rendering (FX vs DX)

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jopezu
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clarification on focal distance rendering (FX vs DX)
8 months ago

i've always assumed that the focal length particulars of rendering, such as face flattening in portraiture, are the exact same for a given focal length regardless of whether you're using a crop or full-frame body.

example, using a 90mm lens/focal length on a full frame body will produce a very particular head-shape render.  using a 60mm on a crop body from the same distance will get the photographer the same exact FRAMING as the 90mm/ff body, but are the rendering aspects such as ear to eye distance/nose shape & appearance, going to be the same as the 90mm/ff combo?  i've always assumed no, that focal length rendering of things like heads and faces is specific only to focal length and not sensor size, and that a crop body is just giving you a smaller window with which to view that focal length.  is that correct?

ie, a 50mm on a crop body.  does that produce facial/head rendering like a 75mm ACTUAL focal length lens would on a full-frame body?

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