Forgot Password
Pentax Camera Forums Home

Show Printable Version Search this Thread
01-29-2013, 11:06 AM   #1
Site Supporter
Jim Radcliffe's Avatar

Join Date: Jul 2011
Location: Dallas, Texas
Photos: Gallery
Posts: 171
DA* 16-50mm SDM failure.. finally happened.

Before I bought the DA* 16-50mm I had read that it was prone to SDM problems (as in failure) but I went ahead and bought it anyway.. It is a great lens and I use it quite often.

A few months ago I noticed that AF was becoming intermittent on it and at first I chalked it up to issues with low contrast focus points.. then it reached the point where I had to actually defocus the lens manually to get it to focus automatically. Then it reached a point where it just would not focus at all and off it went to C.R.l S. in Chandler, AZ.

Spoke with them this morning and it shipped on its return trip to me yesterday. I asked what the repair involved and they informed me that they replaced the SDM. Not unexpected.

Question: If you have had your SDM replaced on that particular lens in the last year or so, how has the lens performed since it was returned from repair? Has the SDM failed again since repair?

It seems the SDM is not quite up to the challenge of moving that much glass around and maybe a stronger SDM is needed for this lens. Your thoughts?

01-29-2013, 11:12 AM   #2
Veteran Member
Aegon's Avatar

Join Date: Jan 2008
Location: Portland, OR
Posts: 1,414
Convert to screwdrive:

Or sell it to me.

My 50-135mm had been in the shop 2 or maybe 3 times. "Fixing" the SDM wasn't a long-term solution. Converting to screwdrive was.
01-29-2013, 11:32 AM   #3
Site Supporter
Site Supporter
RossCo's Avatar

Join Date: Aug 2009
Location: Victoria, British Columbia, Canada
Photos: Gallery | Albums
Posts: 53
I had my 16-50 fixed 2+ years ago and it has worked very well since. It is my go to lens and I have over 30,000 images on my K7 most of them with my fixed 16-50.
01-29-2013, 02:32 PM   #4
Veteran Member
Louicio's Avatar

Join Date: Mar 2012
Location: Melbourne
Posts: 432
Didn't they locate and fix the fault? I believe it was something as simple as a nut that would gradually tighten until it locked up the SDM motor.

01-29-2013, 02:42 PM   #5
Site Supporter
Site Supporter

Join Date: Mar 2009
Location: Gladys, Virginia
Photos: Gallery
Posts: 23,664
I had the SDM motor in my DA *16-50 replaced in October of 2009, about six months after I purchased the lens. It has worked fine since that time.
01-29-2013, 02:44 PM   #6
Tom S.'s Avatar

Join Date: May 2008
Location: S.E. Michigan
Photos: Albums
Posts: 4,303
I recall reading in another post that Pentax changed the SDM motor last year, so if CRIS put in one of the new motors, you should be golden.

  • 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!
16-50mm, da*, focus, k-mount, lens, pentax lens, repair, sdm, slr lens
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Similar Threads
Thread Thread Starter Forum Replies Last Post
Another SDM Failure - 16-50mm f/2.8 Donkeypunch Pentax SLR Lens Discussion 40 12-05-2011 05:09 PM
New To Pentax Forum - DA* 16-50mm SDM Rocky Lotar Welcomes and Introductions 16 11-24-2011 05:02 PM
16-50mm SDM failure, luckily it works again... bymy141 Pentax SLR Lens Discussion 14 06-09-2011 05:04 AM
Second SDM failure for DA*16-50mm lens candgpics Pentax SLR Lens Discussion 19 07-07-2010 04:16 AM
DA 17-70mm SDM vs DA* 16-50mm SDM? shang Pentax SLR Lens Discussion 4 07-02-2010 06:09 AM

All times are GMT -7. The time now is 12:55 PM. | See also:, 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?
Creating a FREE ACCOUNT takes under a minute, removes ads, and lets you post! [Dismiss]