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05-12-2012, 07:57 AM   #1
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K10 Auto Focus Issues

Hello everyone! I wanted to pick the collective brain. My K10 has been refusing to lock focus at the longer end (anything higher than halfway on the zoom range) of a Tamron LD 28-200, a 18-55mm Kit (version 1), and my 50-200 WR. I cleaned the contacts with alcohol and a cloth on the lens and the camera. I tried my best to blow dust from the mirror and sensor. Nothing seemed to work. All the lenses perform fine on my K20. I decided I should try my Tamron 70-200mm f 2.8 just in case. It functions perfectly on the K10 at all zoom lengths and higher aperatures--even in low light. So now I don't have any idea what is going on. Maybe my K10 is a lens snob. Hopefully someone has broken their camera of this particularly annoying pecadillo.

05-12-2012, 11:41 AM   #2
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Could be that there's something wrong with the AF system, as it sounds like it's only manfunctioning at slower lens speeds.
05-12-2012, 04:24 PM   #3
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Adam--I definitely thought the speed was an issue but the Tamron 70-200 f 2.8 functioned at f 13 on the K10. That is my big stumper. You may be right because I can't imagine any other reason for this but I hope someone can tell me different! The next step is calling Pentax Monday. Thanks again!


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