04-19-2012, 04:39 PM
If one side of the image is noticeably soft, that was a lens flaw and you should have got it checked out under warranty.
Putting that aside, stopping down generally helps up to the point where diffraction softening takes over, and further stopping down just makes everything softer. But you're trading against depth of field when you do so. You need to decide where that point it. Best way is to try it yourself. Try using f/5.6, f/8, f/11, f/16 on a scene and compare them.
Putting that aside, stopping down generally helps up to the point where diffraction softening takes over, and further stopping down just makes everything softer. But you're trading against depth of field when you do so. You need to decide where that point it. Best way is to try it yourself. Try using f/5.6, f/8, f/11, f/16 on a scene and compare them.
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