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10-07-2013, 09:13 AM   #1
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Join Date: Oct 2013
Posts: 7
Tamron 18-250mm lens fail to autofocus on upper end


I'm using K200D and Tamron 18-250 lens for 4 years now for my travels.
In last several months I got to the stage where Camera can't establish autofocus on upper end of my lens focal length (last 1/3 towards 250mm).
It jumps before and after focus point all the time.

Manual focus works correctly.
Autofocus on first 2/3 of the focal length is also doing just fine (so far).

Lens is clean and all contacts inside the lens are good (checked by pentax local service).

This problem apeared et the beginning of this year and was getting worse in time. Now it is impossible to use autofocus on the upper end of the focal length.

I tried than lens on other Pentax camera - problem remains.
I tried other lens on myPentax camera - working properly.

My conclusion is that problem lies in lens, not the camera body.

This camera and lens got me 4 years of very pleasent experience with 4 times in Himalaya (among others). It workled hard, but it was never hit, nor left in humid.

Anybody had similar problem? Any idea how to troubleshoot further this problem?


Best regards,


10-07-2013, 10:00 AM   #2
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Join Date: Dec 2008
Location: North Carolina
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Posts: 1,720
Contact Tamron, the lens should still be under warranty if you bought it new, I believe all of their lenses have a 6 year warranty.
10-07-2013, 01:00 PM   #3
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Join Date: Oct 2013
Posts: 7
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Will do.

But, lens i bought in 2009. I'm not sure if 6 years warranty covers lens bought in 2009.

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