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發表於 2013-12-29 00:34:15
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My understanding is that it has both focus shift and severe field curvature. These are different problems.
Focus shift is very real. Under default setting, it has front-focusing below f/2.8. The standard way to deal with this is to focus a little in front (e.g at the nose tip rather than eyelashes when doing close-up portrait) at f/1.4.
Field curvature is a very different problem. It means that if the subject is not at or near the center of the image, the standard focus and re-frame technique may not work accurately.
All these problems are marginal. They certainly affect digital more than film. As a film user, you may not mind at all. As a digital M9 and Monochrom rangefinder user, I find it inconvenient. But then users of M240 and Sony A7 may circumvent these problems by live view.
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