Originally posted by gsrokmix Ok I think I get what you all are saying. So basically the focal length will determine the working distance from camera to subject, & the resulting distance will determine the perspective (w/ associated distortions if any) of the subject?
Exactly.
Quote: She has a very thin face so maybe getting a little closer than farther to her may help round her out a little?
I think you'll find it's the other way around. When shooting from close, the back of her head will be proportionally farther from you than the front. As an extremely example, shooting from only an inch away, the front of the head is obviously an inch away, but the back is like six times farther (or however deep the head is). In a photograph, this makes the face look almost grotesquely thin - with cheeks that just go on forever straight back finally ending with pair of tiny ears in the far distance.
If you wish to make a face look broader, you shoot from a long ways away. Again taking the extreme example, from a mile away, the ears are basically the same away as the nose and there appear in the picture to be in the same plane - her features appear "flattened".
Quote: I really love my DA 55-300 and other than it not being very fast I am hoping I can use this lens for portraits. I guess the trick will be to get people far enough away from the BG to get some nice bokeh at f4 or 5.6.
Here you can use the fact that you do in fact want to be shooting from a distance to your advantage. While the DOF itself doesn't necessarily get thinner as you shoot from farther away with longer focal length (it doesn't because the maximum aperture also changes), the out of focus areas do get blurrier. If you go out to a field somewhere and shoot a fair distance at, say, 150-200mm, you'll get a noticeably broadened face, and the background will hopefully be far enough behind to be blurred into nothingness even at f/4.5 or f/5.6.