http://www.platonphoto.com/portraits...ics/index.html
This very successful photographer, would seem to dispel any notion of a fixed distance being the "best" choice. I really think it depends more upon the subject, than the lens and distance. There is a comfort zone, but that differs between Europeans, Asians, and Americans, so that aspect is more cultural than formulaic.
Avedon early in his career felt he was controlling the subject. Then later he felt that the subject had taken control of the image. Nearer the end of his career he stated that he learned there was an interaction and interplay between the subject and photographer; neither was really in control of the situation.
Ciao!
Gordon Moat Photography
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