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Old Apr 23, 2011, 12:12 AM   #1
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Default sigma 70-200mm 2.8 problem

I have a K20 that i use all the time with the DA* lenses so HSM works with .
so the Sigma 70-200mm f/2.8 II EX DG APO Macro HSM has been in my camera case for quite a while,
maybe 6-10 months as I keep the 16-50 and 50-135 in the quick bag most of the time.
Anyway when I took it out and mounted it, the focus was slow at first and searched all the way out to infinity and stopped slowing down as it went .Didnt start back anymore.

Replaced both battries cleaned the contacts ,installed and remounted lense multiple times and worked the manual focus switch back and forth ,on and off the camera,
at the moment I have my K10 loaned out so I dont have another body I can try it on

So question is am I forgetting anything or any other suggestions before I become concerned enough to send it in to be looked at?
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Old Apr 23, 2011, 1:55 PM   #2
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Hi Chris,

I'm assuming that you cleaned the PZ (SDM ) contacts -- the two larger ones inside the mount. Other than manually working the focus ring, with the lens in AF off the camera, I don't have any suggestions. Sorry.

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