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03-29-2010, 08:45 AM   #1
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Pentax DA* 16-50mm f2.8 on *ist DS

I had only used this lens on a K20D until yesterday. When SDM failed on this lens a couple of months ago, it just sat there or I used it in MF mode but it didn't occur to me about attempting to use it on my *ist DS.

Now its SDM is fixed and it has been working fine on my K20D, I mounted the lens on a *ist DS and it auto-focused via the screw-drive just fine, not very fast but it was spot on every single time, and the few photos I took seemed about the same quality as those from my K20D, validating the lens' superior optics.

I vaguely remember seeing discussions on how to use DA* lenses with failed SDM but is this what it takes, an older DSLR without the SDM contacts?

03-29-2010, 09:11 AM   #2
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Are you saying you sent it to be fixed, or using it on the *ist DS via the screwdrive revived the SDM once you re-attached it to your k20d? That would make some sense, as it seems some of the failures are due to lack of use and the SDM not being able to turn the focus ring. Perhaps using the screwdrive loosens it up and the SDM works again...?
03-29-2010, 10:26 AM   #3
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I thought for a while that I would find a broken SDM lens to use on my *ist DS. I've never seen one for sale. I guess everyone is getting them fixed.
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