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04-22-2011, 09:07 PM   #1
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problems with sigma 70-200mm 2.8

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?

04-22-2011, 09:16 PM - 1 Like   #2
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It would be a good idea to test the lens on another body before getting it serviced under warranty, although this does sound like SDM failure to me. Also, make sure your K10'd firmware is updated to the latest version when you get it back, as otherwise SDM will trivially not work with it

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04-23-2011, 03:56 AM   #3
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So much for HSM being more reliable than SDM if that's the case.

I assume you've been using your DA* lenses OK to date.
Sorry if it is a failure. You should definitely have it fixed if indeed it doesn't work on any other Pentax dSLR that is SDM/HSM compatoble (all of them except the *ist D series, the K110D and K100D).
04-23-2011, 04:16 AM   #4

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Not so nice to read since I'm up for my first Sigma HSM lens to buy.

04-23-2011, 07:07 AM   #5
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Original Poster
Thanks for the replys The K10 will be back soon and I will update it and try and report what happens *fingers crossed*
and yes both of the DA* have worked perfectly.As did the Sigma the last time i used it .

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