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Old Jun 20, 2007, 8:33 PM   #21
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A strong contributing factor to the focus issues is your subject is too small in the frame. The camera is going to have difficulty detecting fine differences in contrast. Not to mention even with perfect focus you lose a lot of detail by cropping so much after the fact.

The subject should fill 2/3 of the frame - the subjects in these photos don't even fill half the frame.

I would suggest two things:

1. Shoot portrait orientation rather than landscape

2. Use the full zoom - you have 300mm, use it all.

Fill the frame 2/3 full and you'll see the sharpness improve dramatically.

I would try shots like that before worrying about a back-focus issue. Frame tighter and I'm betting a good portion of your problem goes away. Good luck and looking forward to your next shots
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Old Jun 28, 2007, 3:26 AM   #22
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I had K10D, I had noticed that the AF sensor is quite big than the redAF area (at center focus). AF sensor is bigas thecircle in viewfinder, in that casewideanglecan bea big problem. Because AF can focus to many other objects in that circle (specially to more contrast objects) at wideangle.

I believepeople thinks there is an back focus issue.

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