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08-29-2012, 09:31 PM   #1
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DA 16-45mm focus problem?

I shooted at my local air show last sunday. Though 16-45mm isn't fit for the air show, I tried to make some fun with it. But how surprising it was for me to look at the picture, the picture looks very soft at 45mm and the corner looks very bad. Can anyone help figure it out? Is this the focus problem? Thanks!

08-30-2012, 12:19 PM   #2
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Known problem, see here, at 'Portait Format Softness'.
08-30-2012, 11:32 PM   #3
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QuoteOriginally posted by glasbak Quote
Known problem, see here, at 'Portait Format Softness'.
08-31-2012, 03:57 AM   #4
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Hard to tell based on just this image; it's not easy to tell whether or not hazy clouds are in focus, and that fills most of the frame. My copy of the 16-45 back focuses on my camera (which, being a K10D, means I can't adjust it) and also focuses past infinity, which could easily lead to shots like this. Are you using a camera with front/back focus adjustment?

08-31-2012, 04:20 AM   #5
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The front group of the 16-45 has a lot of play (mine has), gravity puls it down, and the decentering error caused by this is catched by the sensor outer edges in portrait position.
Keeping the front group centered (by an elastic band but do not use autofocus), results in a much better performance, I noticed.

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