clarification on focal distance rendering (FX vs DX)

Started Jan 17, 2014 | Discussions thread
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jopezu
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clarification on focal distance rendering (FX vs DX)
Jan 17, 2014

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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