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05-09-2010, 12:54 PM   #1
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Tamron 18-250mm not auto focussing above 100mm


I have a Tamron AF 18-250mm 3,5-6,3 Di II LD ASL Macro which I have been happily using on my K20D for a year or so now.

Suddenly the other day as I was out shooting I was finding that it would not auto focus above a certain focal length (approx 100mm I found after testing). Below this the AF worked fine, above this the camera would just continually hunt and not lock on the target.

It still works fine in MF mode.

I've tested the body with the kits lens and these all work fine. I will try to test the Tamron on a GX-10 I have but this is currently out of action (some sort of battery issue).

Has anyone ever seen this with a lens or this lens before? Anything to try before I try to see if it is still covered and I can find my warranty etc?



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100mm, 18-250mm, af, auto, k-mount, lens, pentax lens, slr lens, tamron, tamron 18-250mm
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