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01-29-2011, 06:37 PM   #1
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K20D, DA15, and FA50 1.8 and Back Focusing Mystery

So When I was having some issues with my DA15 back focusing earlier today, I set up a chart and such and did some 45 degree focus testing. The tests revealed that both my DA15 and FA50 where back focusing. At +3 FA50 was about as good as it was going to get at F/1.7. My DA15 at F4 (which I just got from B and H) required an 10+ adjustment and even then wasn't right. It seemed to get better though.

I am inclined to believe that the DA Limiteds are manufactured to some tighter tolerances so I would find it hard to believe that I would be getting such a bad back focusing copy. For all I know, the K20d could be WAY off in one direction and my FA50 is way off to correcting in the other direction hence the modest +3 adjustment..

My Body and 50 could be very bad in the opposite directions and are meeting in the middle, or I have a bad 15. I had a Sigma 18-50 which was forward focusing but sold that.

Anyone have any other suggestions for test I could do.

OR do i need to send the DA15 back to B and H or send them all into Pentax??


Last edited by Chwisch87; 01-29-2011 at 06:43 PM.
01-29-2011, 08:39 PM   #2
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I've focus-tested a lot of lenses on my own K20D, and none of them ever needed +/- 10. My DA 15 required +4. If it was me I'd send that lens back for a replacement.
01-29-2011, 09:50 PM   #3
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Reset your camera then it will be fine.
01-29-2011, 10:03 PM   #4
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Reset the camera.. Still took a +20 to get it to focus correctly. The 50 was the same at a +3.

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