I hear that a lens is in it's 'zone' stopped down 2-3 stops from wide open, where it will be 'within it's specs'.
What I'm curious is what are the 'qualities' of a lens as it's opened up, for the different lens designs? How, for example, does focus soften as a triplet like a Geronar is opened up? Is it 'better' or 'worse' than a tessar? What are the focus and coverage issues for triplets, tessars, plasmats, etc like as the lens is opened up? What other issues are there?
My interest (right now) is in photographing people - environmental portraits to head shots, and want to constrain depth of field in the series.
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