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05-15-2012, 05:52 AM   #31
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QuoteOriginally posted by interested_observer Quote
I am just asking some questions here - inquiring minds and all of that....
  • Does the K5 AF well with other lenses?
  • Is the problem just localized to only the 8-16?
  • You might want to take you camera to B&H with you for the exchange and test the new one on the spot.
the auto focus of 8-16 is really bad on my k-5. at least for my copy.
I am going to exchange today.
the auto focus of my 16-50 and 50-135 is very good.

05-15-2012, 12:49 PM   #32
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Ok, went to B&H today. they have no more left for exchange....
I would assume the one I got might be a bad copy other people returned too.
I got refund instead
I will try go to Adorama tomorrow.
I could consider sigma 10-20 f4-5.6.
but really 8mm is an addiction after using it.
05-24-2012, 04:50 PM   #33
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I'm loving this lens, but sharp in the corners it aint.
Have you tried Lightrooms lens corrections? it actually does a decent job with this lens. Unfortunately, you have to adjust the Exif to get it to work, as described in this thread:

https://www.pentaxforums.com/forums/post-processing-articles/176330-sigma-8-1...ally-8-mm.html



05-24-2012, 07:27 PM   #34
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I returned this lens...disappointed by the QC.
I just bought a used pentax 10-17 fisheye here.
can not wait to recieve it.

05-24-2012, 10:26 PM   #35
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That s a good lens too, but different. And you still need 8-16..
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