snegron
Member
That makes more sense and explains your constraints better. You could devise a test by using just a few people in the center and corners because you know that a) the center of lenses is always sharper and b) the corners are always the less sharp. I suppose getting the details on the face matters, hence your question for sharpness. Try to position yourself at an appropriate distance from your subjects, as would happen in the real situation, expose shots at all the relevant apertures, and have mega-hi-res scans made or prints the size that you need, and frankly that should tell you a good deal already.
Just my 0.02$
I think this might be the only alternative I have at this time. I had the thought that the flatness of field with each lens might have some impact on edge to edge sharpness as well. There is a slight distortion on the edges of the 35mm focal length that is not as apparant with the 50mm lens. I can correct this slightly with proper positioning of subjects/camera and obtain sharper images by stopping down a bit, but I wonder if my subjects on the ends will be out of focus with the 35mm due to its slight lens curvature? I wonder if the subject's faces on the edges will look slightly out of focus with the 35 more so than with the 50mm?