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But.. that is not desirable in portraits? Sharp in the center going softer in the edges?
Poorer peripheral sharpness is often considered less problematic for portrait applications, but is unlikely to be considered a positive lens attribute. With a fast lens like this, you generally let the shallow depth of field and subject/background separation provide soft backgrounds around an in-focus subject, rather than relying on poor lens performance to smear out in-focal-plane edge areas. You might not always want portraits with the subject right at the center; and a "portrait" lens can be used for more than portraits. Both the CY and ZE lens are perfectly good lenses, and for particular subjects (and matters of taste), a (slight) advantage could go to either one (and, in most cases, they will be hard to tell apart at all). However, the MTF comparison between the old and new lenses indicates that the old CY is in no general way optically inferior to its ZE counterpart.
Edited on Jun 11, 2013 at 05:46 PM · View previous versions