Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
06-07-2011, 08:12 AM   #1
Veteran Member




Join Date: Aug 2007
Photos: Gallery
Posts: 1,563
16-50mm SDM failure, luckily it works again...

We have been visiting Berlin this weekend.
While taking pictures inside the Berliner Dom, AF stopped working on my K5/DA*16-50mm combination.
All AF switches were in the right position, off-on switching, battery out, all failed to revive AF.
I feared for a SDM motor lock-up as has been reported so many times.
I started to make MF photo's for a while, knocked on the lens a couple of times and tried AF again after an hour or so.. it worked again!

My DA* 16-50mm is one of the first batches and I guess it has >100k photos on its record.

Bert

Berlin is a nice city by the way:

K-5 + 10-17mm:



K-5 + 16-50mm:





06-07-2011, 08:35 AM   #2
Loyal Site Supporter
blackcloudbrew's Avatar

Join Date: Mar 2009
Location: Cotati, California USA
Photos: Gallery | Albums
Posts: 3,816
Wow, sorry about the trouble but I love those shots. They are just wonderful.
06-07-2011, 10:09 AM   #3
Veteran Member




Join Date: Jan 2007
Location: New Mexico
Photos: Albums
Posts: 1,125
So, do we need to carry a small rubber mallet in our camera bags? Glad that the problem was so easily solved. Let's hope that it does not recur. Your photos show that there is nothing wrong with the optics of your lens. Nice work.

Rob
06-07-2011, 10:15 AM   #4
Site Supporter
psychdoc's Avatar

Join Date: Jul 2010
Location: Bham
Photos: Gallery | Albums
Posts: 943
Great lens. Er, great photography skills. Glad your equipment survived the CPR...

06-07-2011, 10:24 AM   #5
Veteran Member
Pentaxor's Avatar

Join Date: May 2009
Location: Vancouver, B.C.
Photos: Gallery
Posts: 6,513
remember the time when we used to pound on the tv whenever we lose the reception? I guess the same can be done with the SDMs.
06-07-2011, 01:01 PM   #6
Ash
Community Manager
Loyal Site Supporter
Ash's Avatar

Join Date: Mar 2007
Location: Toowoomba, Queensland
Photos: Gallery | Albums
Posts: 22,695
Very nice symmetrical captures Bert.
Was there a long delay between usage on the 16-50 that may have caused the hiccup?
06-07-2011, 01:17 PM   #7
Moderator
Site Supporter
Blue's Avatar

Join Date: Jun 2008
Location: Florida Hill Country
Photos: Gallery | Albums
Posts: 17,212
QuoteOriginally posted by Pentaxor Quote
remember the time when we used to pound on the tv whenever we lose the reception? I guess the same can be done with the SDMs.
It would be more gratifying to pound it up the side of a Pentax official's head!
06-07-2011, 01:51 PM   #8
Veteran Member
Pentaxor's Avatar

Join Date: May 2009
Location: Vancouver, B.C.
Photos: Gallery
Posts: 6,513
QuoteOriginally posted by Blue Quote
It would be more gratifying to pound it up the side of a Pentax official's head!
good idea. who knows, it might start working again, like an electronic equipment should.

06-08-2011, 08:36 AM   #9
Veteran Member




Join Date: Aug 2007
Photos: Gallery
Posts: 1,563
Original Poster
QuoteOriginally posted by Ash Quote
Very nice symmetrical captures Bert.
Was there a long delay between usage on the 16-50 that may have caused the hiccup?
Hi Ash,

It was not working for about 2 hours.
I was just so fed up with the problem!
We were walking through Berlin, wonderfull weather, lots of picture opportunities and no other lens with me besides my 10-17mm, so I guess I started hitting the lens in anger...

Ah well, it worked again!

Bert

NB We were very positively surprised by Berlin.
Much more to see than we anticipated, nice people, nice prices (except on prime locations, but what do you expect), relaxed atmosphere, great for architecture shooting, great musea.
06-08-2011, 09:01 AM   #10
Pentaxian




Join Date: Nov 2008
Location: Bangalore
Photos: Gallery
Posts: 2,450
Beautiful pictures.
06-08-2011, 09:22 AM   #11
Veteran Member
philippe's Avatar

Join Date: Apr 2008
Location: Flanders Fields
Posts: 463
My DA* 16-50 mm causes me troubles when I shoot straight down- and/or straight upwards. It's like the construction can't hold the focussing and focal distance due to the weight of the lens system. The lens body moves very slowly along the gravity and when I try to focus, then after a while the whole thing tends to lock-up.
I saw that you were shooting the ceiling of these buildings, that's straight upwards
I wonder if this happened to somebody else too?
06-08-2011, 09:43 AM   #12
Senior Member




Join Date: Oct 2008
Location: Prince George, British Columbia, Canada.
Posts: 129
Those are beautiful photos wish I was there to do the same! I have four Da* lenses when they start to act up I quickly removed them and wipe the contacts with a clean microfiber cloth. This procedure has worked quite well. Only one true SDM failure on my very early 50-135. This is just my thought, but I think some of the lens failures are not the motor but the quick shift clutch but that is just my gut feeling.
06-08-2011, 09:54 AM   #13
Veteran Member




Join Date: Aug 2009
Photos: Gallery
Posts: 1,236
QuoteOriginally posted by bymy141 Quote
It was not working for about 2 hours.
I was just so fed up with the problem!
We were walking through Berlin, wonderfull weather, lots of picture opportunities and no other lens with me besides my 10-17mm, so I guess I started hitting the lens in anger...
Did you year any noises come from the lens when you tried to focus or see the distance scale move very slightly?

At least with my DA* 300mm f4 I've had a few times where the connection between the screw-drive of the lens and camera body wasn't fully aligned or something, preventing the SDM motor from being able to focus the lens. So all I had to do was rotate the camera body's spring loaded screw-drive AF connector a bit and the lens worked just fine after that.
06-08-2011, 06:49 PM   #14
Veteran Member




Join Date: Jan 2007
Location: New Mexico
Photos: Albums
Posts: 1,125
QuoteOriginally posted by bymy141 Quote
Hi Ash,

It was not working for about 2 hours.
I was just so fed up with the problem!
We were walking through Berlin, wonderfull weather, lots of picture opportunities and no other lens with me besides my 10-17mm, so I guess I started hitting the lens in anger...

Ah well, it worked again!

Bert

NB We were very positively surprised by Berlin.
Much more to see than we anticipated, nice people, nice prices (except on prime locations, but what do you expect), relaxed atmosphere, great for architecture shooting, great musea.
Are you aware that the DA*16-50 will work in MF mode, even if the SDM AF fails? This means that you can still shoot with it under duress and are not truly deprived of the lens. If you are not accustomed to focusing manually, it might not be a bad idea to work on your MF skills, including "Catch in Focus," just in case the SDM fails again. I have practiced with MF for that very reason.

Rob
06-09-2011, 05:04 AM   #15
Veteran Member




Join Date: Aug 2007
Photos: Gallery
Posts: 1,563
Original Poster
QuoteOriginally posted by philippe Quote
My DA* 16-50 mm causes me troubles when I shoot straight down- and/or straight upwards.
No Philippe, my lens has never experienced that problem. I've had that lens little over 3 years now, had it repaired for a loose front element and have dragt it around the world since then.

QuoteOriginally posted by BCtoad Quote
I have four Da* lenses when they start to act up I quickly removed them and wipe the contacts with a clean microfiber cloth.
If it ever happens again, I'll try that. Microfiber cloth is standard in my bag.

QuoteOriginally posted by sjwaldron Quote
Did you year any noises come from the lens when you tried to focus or see the distance scale move very slightly?
No, I did not hear any noise, but I did not really check close by.

QuoteOriginally posted by robgo2 Quote
Are you aware that the DA*16-50 will work in MF mode, even if the SDM AF fails? Rob
Yes, I know. That's how I survived the intermediate period...

- Bert
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!
16-50mm, af, berlin, k-5, k-mount, pentax lens, sdm, slr lens, times
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
Is this Pentax way of admitting SDM was a failure? mfdesalas Pentax SLR Lens Discussion 49 12-28-2010 11:34 PM
The official SDM AF Failure Thread Donkeypunch Pentax SLR Lens Discussion 43 07-16-2010 04:48 PM
SDM Lens Failure stevebrot Pentax SLR Lens Discussion 79 07-10-2010 05:02 PM
Second SDM failure for DA*16-50mm lens candgpics Pentax SLR Lens Discussion 19 07-07-2010 04:16 AM



All times are GMT -7. The time now is 08:40 AM. | 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