The bokeh issue is part optics, part film. I have noticed that high-speed
films--even Delta 400 pushed two stops, don't react the same to bokeh as
lower-speed films. You will see this with digital too. A lens which works
great on film isn't necessarily so great on digital. My 100/2.8 is awesome
on film, hohum on the E-1. I suspect that it has to do with USM. What does
USM have to do with film? During the development process, some
film-developer combinations allow substantial grain migration which forms
the same type of edge brightness artifacts as USM. (halos and such).
AG
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