Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
06-07-2013, 07:30 PM   #1
Junior Member




Join Date: Oct 2012
Posts: 27
DA*16-50 SDM and MF failure???

SDM gave up on this lens a couple of days ago. I knew this would probably happen some day but I thought I'd still be able to focus manually. Is this a typical SDM failure that also MF will not work? I turn the focus ring and nothing happens.

When i use the lens on my old 135-film camera the screw drive AF works without any problem (but not MF).


Last edited by Phii Mii; 06-07-2013 at 11:33 PM.
06-07-2013, 08:33 PM   #2
Veteran Member




Join Date: Feb 2012
Location: Fredericton, New Brunswick
Photos: Gallery
Posts: 631
Sounds like the MF/AF clutch used for quick shift has broken perhaps? Seems like a repair job is in order...

Alternatively, look at the guide to convert it to screw driven AF if you'd like.
06-07-2013, 08:47 PM   #3
Veteran Member
Steinback's Avatar

Join Date: Jan 2008
Location: GTA, ON, Canada
Photos: Gallery | Albums
Posts: 1,673
Manual focus should still work; it does sound like something is jammed beyond the regular SDM motor failure. There is a repair guide on here for taking apart the back of the lens and freeing up the SDM motor with a screwdriver but I don't know if that will take care of whatever else may be wrong.

If you have an older camera body like the K10d or K20d the screwdrive conversion process is pretty easy - it took me about 5 minutes since my camera was already running in developer mode. My SDM motor still works but I was curious to compare it to screw drive, which is nosier but otherwise similar in speed and accuracy.
06-07-2013, 11:38 PM   #4
Junior Member




Join Date: Oct 2012
Posts: 27
Original Poster
I'd prefer it without AF but still with MF. I'll check how much it would cost to fix the MF since AF isn't important.

06-08-2013, 05:07 AM   #5
Veteran Member
Anvh's Avatar

Join Date: Sep 2011
Posts: 4,616
Pentax have said that one of the causes of the AF failing with this lens is due to a misalingment with on of th shafts.
First time hearing that MF also actually stop working but seems to comfirm it can happen.

Don't know where you live but maybe you can force extra warranty from Pentax, if there is no external damage to the lens or something like that.
06-08-2013, 06:29 AM   #6
kyc
Forum Member




Join Date: Sep 2009
Photos: Gallery | Albums
Posts: 68
Similar occurrence on DA* 60-250

I had this symptom on my 60-250 twice, where the SDM stopped working and I couldn't get MF to work (the focus ring turned but the gear seemed to have been disengaged). The first time lasted for a while and by playing with MF I eventually got the lens fully working. A few months later, I had the same issue by for a much shorter time. Since then, no problems.

What I noticed about the two instances was that I was out in the summer sun using the lens for a lengthy period, so I suspect it may be heat related.
06-08-2013, 06:33 AM   #7
Veteran Member
ve2vfd's Avatar

Join Date: Aug 2007
Location: Montreal, Canada
Photos: Gallery
Posts: 2,433
The AF died twice on my DA*16-50...

The first time the AF died (within 90 days of buying the lens) the manual focus was still working.

The second time the AF died (1.5 years after buying it), the manual focus ring no longer worked at all and they had to change the MF clutch and AF motor.

Pat
07-06-2013, 09:01 AM   #8
Junior Member




Join Date: Oct 2012
Posts: 27
Original Poster
QuoteOriginally posted by Phii Mii Quote
SDM gave up on this lens a couple of days ago. I knew this would probably happen some day but I thought I'd still be able to focus manually. Is this a typical SDM failure that also MF will not work? I turn the focus ring and nothing happens.

When i use the lens on my old 135-film camera the screw drive AF works without any problem (but not MF).
Update: The SDM and the quick shift is working fine again. I didn't use the lens for a few weeks and was going to send it o be repaired but wanted to test it once before and this time it worked fine

By the way, when it stopped working I was laying on my back and taking photos through the tree tops. Maybe to heavy for the SDM motor?

07-06-2013, 09:33 AM   #9
Site Supporter
K57XR's Avatar

Join Date: Feb 2011
Location: Colorado, USA
Posts: 828
QuoteOriginally posted by Phii Mii Quote
Update: The SDM and the quick shift is working fine again. I didn't use the lens for a few weeks and was going to send it o be repaired but wanted to test it once before and this time it worked fine

By the way, when it stopped working I was laying on my back and taking photos through the tree tops. Maybe to heavy for the SDM motor?
Good to hear your lens is working again however; it shouldn't do what it did regardless. I'd suggest sending it in for repair/checkup nonetheless. Good luck.
Reply

Bookmarks
  • Submit Thread to Facebook Facebook
  • Submit Thread to Twitter Twitter
  • Submit Thread to Digg Digg
Tags - Make this thread easier to find by adding keywords to it!
focus, lens, mf, pentax help, sdm
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
DA* 16-50mm SDM failure.. finally happened. Jim Radcliffe Pentax SLR Lens Discussion 5 01-29-2013 02:44 PM
DA*50-135 SDM failure, how much to repair? eddy16112 Pentax SLR Lens Discussion 31 08-06-2012 12:31 PM
DA* 50-135 SDM failure pattern? yusuf Pentax SLR Lens Discussion 7 10-15-2010 10:00 AM
Second SDM failure for DA*16-50mm lens candgpics Pentax SLR Lens Discussion 19 07-07-2010 04:16 AM
Lens offer from Amazon: DA* 50-135 SDM & DA* 16-50 SDM f8 Pentax SLR Lens Discussion 4 03-25-2008 04:45 AM



All times are GMT -7. The time now is 10:43 PM. | See also: NikonForums.com, CanonForums.com part of our network of photo forums!
  • Red (Default)
  • Green
  • Gray
  • Dark
  • Dark Yellow
  • Dark Blue
  • Old Red
  • Old Green
  • Old Gray
  • Dial-Up Style
Hello! It's great to see you back on the forum! Have you considered joining the community?
register
Creating a FREE ACCOUNT takes under a minute, removes ads, and lets you post! [Dismiss]
Top