user237428934
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Initially they were all made to be optimized at 2.8. For the last year or so, they've all been optimized for 1.5 ON FILM and Zeiss doesn't guarantee that it will work 100% on digital but they will send it to Germany to be optimized if it is off for any reason, free of charge.
Thanks but optimized for what? Does sharpness decrease at 1.5 when it's not optimized for 1.5? When it's optimized for 1.5, what happens when used at other apertures? Questions over questions.