Here's a question that has been bugging me lately:
I understand that a 50mm lens mounted on a 1.6 crop body has an equivalent FOV as an 80mm lens mounted on a full frame body.
I also understand that in portraiture, standing farther away from the subject yields a more flattering photo, as doing so de-emphasizes the size of the nose and other facial features.
My question is, if I use a 50mm lens on a 1.6x crop body for a head-shoulders portrait of someone, will the emphasis on facial features be different than if I use an 80mm lens on an FF body, assuming both shots are framed identically (that is, the head takes up the same area of the print in both cases)?
Another question is, will I be standing the same distance away from my subject with a 50mm on a 1.6x crop body as I would with an 80mm on an FF body in order to frame both shots identically?
I guess the real question is, is 50mm too short to be using for head-shoulder or head-only portraits on a 1.6 crop body, or is it just right since the equivalent FOV is that of an 80mm lens on an FF body?