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10-26-2011, 08:42 AM - 1 Like   #1
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DA* 50-135 overexposes and squeaks too.

I bought a used 50-135 and after 2 months it started to squeak when focussing. No returns possible. Also, it over exposes as I stop down past f/2.8 to f/8 and worse in Av priority. So the metering info between the lens and body is having an issue. I tried cleaning the contacts with a lens cloth. I rubbed it really good but no difference. Do I need to use alcohol? Should I send in for repair? Is there a diy guide to fixing this? Also, I not happy with the AF performance. I swear it was decent when I first got it but it was so lousy in a low light wedding I recently did.

10-26-2011, 08:47 AM   #2
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Squeaking = failing (or already failed) SDM. Its high time Pentax gave us the firmware update to enable the non-SDM AF mode.
10-26-2011, 09:51 AM   #3
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Take a look here > DIY SDM repair v1.0, but only if it stops completely.

Haven't/wouldn't do it myself, but...

I've seen a few threads where lenses have been resurrected by using them manually for a short while, but can't point you at them I'm afraid.

Lack of regular use seems to be an issue, so I give mine a work-out every few weeks. No problems yet.
10-26-2011, 08:31 PM   #4
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Oh yeah. Mine squeaks like rabbits being ran over by a truck.

10-26-2011, 09:26 PM   #5
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But whats up with the over exposing? Aside from the huge problems, the images are very good in sharpness, contrast and color.(When properly focussed!)
10-28-2011, 09:28 AM   #6
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Anyone know where to buy the sdm motor?
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