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04-30-2015, 03:23 PM   #1
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Any word about the DA 16 50mm SDM motor issue getting resolved?

I know some of you have had the 16 50 for a year or more with no SDM issues, and that others have either repaired their's or just started using it as a screw drive. I'm curious though, has Pentax by any chance just resolved the issue in more recent copies?

04-30-2015, 03:36 PM   #2
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It was fixed in mid-2012, supposedly.

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04-30-2015, 07:50 PM   #3
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QuoteOriginally posted by Adam Quote
It was fixed in mid-2012, supposedly.
Is there like s serial number datsbase from which we could knowsif a specific SDM featured lens has been manufactured before or after the "alleged" fix was applied?

Do all SDM lenses suffered or were prone to show the problem?
04-30-2015, 10:21 PM   #4
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The fix is the "DC motor": > 18-50, 18-135, 16-85, 70-200, 150-450.

04-30-2015, 10:46 PM   #5
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QuoteOriginally posted by rburgoss Quote
Is there like s serial number datsbase from which we could knowsif a specific SDM featured lens has been manufactured before or after the "alleged" fix was applied?
.. not quite, but it could help:

SMC Pentax-DA* 16-50mm F2.8 ED AL [IF] SDM Serial Numbers - Pentax Serial Number Database - PentaxForums.com
04-30-2015, 11:07 PM   #6
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If you buy 'used' lens, then there is a chance that it would still have the older SDM motor part which could fail. If you buy new, then the chance of failure is probably very low. I have the one from the early production, but soon was replaced with a different lens fitted with the non-faulty SDM motor. It has been working since then; I have used it in many events (usually with the DA* 50-135).
04-30-2015, 11:39 PM   #7
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We've got to try to see if it breaks or not. As far as I understood, the conversion from SDM to screw drive was done via hacking of the firmware. How is it done with the K-3 ?

Last edited by biz-engineer; 05-01-2015 at 03:21 AM.
05-01-2015, 06:12 AM - 1 Like   #8
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QuoteOriginally posted by biz-engineer Quote
We've got to try to see if it breaks or not. As far as I understood, the conversion from SDM to screw drive was done via hacking of the firmware. How is it done with the K-3 ?
What I want to know is: why did Pentax build screw-drive into the SDM lenses, but not provide a manufacturer-sanctioned method to de-activate the SDM and activate the screw-drive?

05-01-2015, 07:05 AM   #9
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QuoteOriginally posted by pete-tarmigan Quote
What I want to know is: why did Pentax build screw-drive into the SDM lenses, but not provide a manufacturer-sanctioned method to de-activate the SDM and activate the screw-drive?
The screw drive is there for older cameras that didn't support SDM. Screw drive was not added purely as a backup to SDM.
05-02-2015, 04:34 AM   #10
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QuoteOriginally posted by DeadJohn Quote
The screw drive is there for older cameras that didn't support SDM. Screw drive was not added purely as a backup to SDM.

If that's the case, has anyone tried simply taping over the SDM contacts and see if it would revert to screw-drive? Or does the hand-shaking between the camera and lens tell each other "SDM present on both" and then screw-drive is automatically disabled?
05-02-2015, 10:57 PM   #11
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QuoteOriginally posted by Achromatter Quote
If that's the case, has anyone tried simply taping over the SDM contacts and see if it would revert to screw-drive? Or does the hand-shaking between the camera and lens tell each other "SDM present on both" and then screw-drive is automatically disabled?
People have tried without success.
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