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03-19-2012, 02:32 PM   #1
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Focus problem 50-200mm WR lens

I'm having a focus issue with a 50-200mm WR lens that I picked up off of ebay. Pics taken at 50mm aren't in focus, but they are in focus above 100mm. Any suggestions as to what is wrong with the lens?


Original at 50mm


50mm cropped


200mm

03-19-2012, 02:34 PM   #2
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I forgot to mention that I always use the center focus point.
03-19-2012, 06:43 PM   #3
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Have you installed the latest firmware update (v 1.13 for K5). ?
03-20-2012, 10:21 AM   #4
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I'd repeat with a more controlled test. It isn't *obvious* what else the camera might have chosen to focus on in that test, but there is also no way to see where in fact focus was in order to make hypotheses.

03-20-2012, 01:36 PM   #5
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QuoteOriginally posted by SuperK5 Quote
Have you installed the latest firmware update (v 1.13 for K5). ?
I'm using it on a k10d.
03-20-2012, 05:25 PM   #6
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QuoteOriginally posted by HeavyD Quote
I'm using it on a k10d.
Oh Yea!!! ...I forgot to ask which camera you were using... but anyway try the one for your camera (V1.31 for K10D) . I've heard they do silent updates
to the firmware sometimes. Maybe you will get lucky and get updated lens parameters. It only takes a few minutes and it's free!

The link to the PENTAX update page.
Latest K10D Firmware Update : Software Downloads : PENTAX
03-20-2012, 05:40 PM   #7
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Here are more pics to compare with.


50mm


100mm


200mm


50mm


50mm cropped


200mm

The lens seems to be out of focus on the short end and sharp on the long.
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