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06-06-2011, 09:35 AM   #1
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Yet another DA*16-50 SDM death...

Unbelievable... I've had my brand new DA*16-50 five months and the SDM motor has already seized... just when I need it most.

*sigh* I guess I should have expected it...

And now the pain in the ass of sending it in to Pentax Canada and losing it for my summer vacations. Glad I did not sell my Tamron 17-50... it front focuses like crazy, but at last it works.

[ venting] Thanks Pentax... thank you very much... [ /venting]

Pat

06-06-2011, 09:45 AM   #2
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How about this?!

We start a sticky where everyone can register their DA*16-50 (or any SDM for that matter) with the original purchase date, approximate usage and when they fail to better keep track of how long they last. It could almost be a game to see who the winner is ! ! !
06-06-2011, 09:54 AM   #3
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QuoteOriginally posted by littledrawe Quote
We start a sticky where everyone can register their DA*16-50 (or any SDM for that matter) with the original purchase date, approximate usage and when they fail to better keep track of how long they last. It could almost be a game to see who the winner is ! ! !
Right, this should be needed for all SDM lenses, at least to give feedback to Pentax.
06-06-2011, 01:08 PM   #4
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Sorry to hear that Pat.
Have your 17-50 calibrated and you won't feel the pain all that much.
Have the 16-50 serviced then decide what you'll do with it.
Hope it works out for you in the end.

06-06-2011, 01:09 PM   #5
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What is the MTBF of these SDM motors? Based on the feedback so far it looks like about 2 years or so.
06-06-2011, 01:19 PM   #6
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Well it is a shame. I had two copy's off this lens, one was DOA (not SDM) and the other not to my likes.

No wonder the SDM-II is popular: https://www.pentaxforums.com/forums/pentax-slr-lens-discussion/146454-wich-le...r-d-money.html
06-06-2011, 03:37 PM   #7
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QuoteOriginally posted by manishved Quote
What is the MTBF of these SDM motors? Based on the feedback so far it looks like about 2 years or so.
I'd say a little less 18 months perhaps? For the 16-50 it's probably more like 12 months. My 50-135 is 11 months old and still going strong though...
06-07-2011, 06:44 AM   #8
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I came very very close to picking up a 16-50 to have a weather sealed lens to use on the river during a research project. I opted for a DA 18-55 WR instead. This is the very reason!!!! I really like the optics of this DA* though.

06-07-2011, 06:55 AM   #9
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Sad to hear this Pat. Get the Tamron calibrated. It's just as good a lens and won't give you the issues the DA* does.

I can't believe that after a couple of years, Pentax has done nothing to address this.

Not that Pentax cares but after 3 of these duds, it's one of the reasons I don't have much Pentax gear anymore.
06-07-2011, 12:24 PM   #10
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my copy is 2 years old. the 16-50 focus is acting up. the 50-135 stills working well....

has anyone tried disabling SDM contacts? i compared the diff between mechanical AF and SDM, there are 2 SDM contacts plus another contact button on the mount. i tried masking the 2 SDM contacts with tape, didn't work. but i haven't figure out how to cleanly mask the 3rd button in the lens. The hope here, of course, is to fool the camera into body AF, and keep these little gem working.

what a shame that we have to do this. I am not buying another SDM until morality improves.

Last edited by truonganh; 06-07-2011 at 12:32 PM.
06-07-2011, 01:17 PM   #11
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no wonder they are trying out a DC motor on their new zoom lens.
06-07-2011, 03:31 PM   #12
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QuoteOriginally posted by truonganh Quote
my copy is 2 years old. the 16-50 focus is acting up. the 50-135 stills working well....

has anyone tried disabling SDM contacts? i compared the diff between mechanical AF and SDM, there are 2 SDM contacts plus another contact button on the mount. i tried masking the 2 SDM contacts with tape, didn't work. but i haven't figure out how to cleanly mask the 3rd button in the lens. The hope here, of course, is to fool the camera into body AF, and keep these little gem working.

what a shame that we have to do this. I am not buying another SDM until morality improves.
Doesn't work, you have to fry the SDM in the body not the lens for it to work with screw drive, that or buy a K10 with old firmware.
06-07-2011, 03:43 PM   #13
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QuoteOriginally posted by twitch Quote
Doesn't work, you have to fry the SDM in the body not the lens for it to work with screw drive, that or buy a K10 with old firmware.
My DA* 300mm will work with *istD. But of course it is a 6 mp sensor.
06-09-2011, 06:09 AM   #14
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Well folks as I am in my vacations and need my lens I just went ahead and used the DIY repair method as described in https://www.pentaxforums.com/forums/pentax-slr-lens-discussion/130429-diy-sup...or-repair.html. I am quite handy with that kind of stuff so it was a breeze.

The lens came back to life and I'll be happy if I can get a few weeks out of it, then I'll send it in to Pentax for a new SDM motor when it seizes again...

I hate to admit it, but the quality of the DA*16-50 optics is the reason I am willing to put up with the crappy quality of the SDM system (not sure I'll be as cavalier about it when my DA*60-250 seizes though!!!!) But still... come on Pentax, seizing after merely 5 months???

Pat
06-09-2011, 09:07 PM   #15
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yeah the DIY instruction looks quite do-able. i will give that a shot.
i'm just wondering how long that would last before you have to open the lens back up. keep us posted.
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