Forgot Password
Pentax Camera Forums Home
 

View Poll Results: for thos who own or have used the DA*50-135mm f2.8 Hows the SDM?
SDM Problems 2539.68%
No Problem / SDM works fine 3860.32%
Voters: 63. You may not vote on this poll

Reply
Show Printable Version Search this Thread
03-19-2010, 08:18 AM   #16
Junior Member




Join Date: May 2009
Location: Dawg Country
Posts: 41
I don't have a 50-135, but I was just getting ready to pull the trigger and buy one. As of yesterday, I couldn't even find one to buy online in the U.S. Sorry if I'm slow, but did I miss something? Has Pentax stopped shipping the 50-135 for the time being due to the SDM issues?

I'm actually glad I couldn't find one yesterday because I would have purchased it. I'm thinking of staying far away from SDM for now.

03-19-2010, 09:03 AM   #17
Veteran Member
rustynail925's Avatar

Join Date: Aug 2009
Location: Philippines
Photos: Gallery
Posts: 1,552
Original Poster
Try adorama, amazon, B&H
03-19-2010, 09:51 AM   #18
Junior Member




Join Date: May 2009
Location: Dawg Country
Posts: 41
QuoteOriginally posted by rustynail925 Quote
Try adorama, amazon, B&H

Yeah those are the obvious ones and the first places I looked, but as of yesterday, they are all out of stock. Like I said, I couldn't find a single place to buy a 50-135 online in the U.S.
03-19-2010, 10:19 AM   #19
Veteran Member
rustynail925's Avatar

Join Date: Aug 2009
Location: Philippines
Photos: Gallery
Posts: 1,552
Original Poster
Lets hope they are replacing it with the new sdm motor

03-19-2010, 11:50 AM   #20
Veteran Member
GoremanX's Avatar

Join Date: Dec 2009
Location: Georgia, VT
Photos: Albums
Posts: 1,653
I had a thought about this while I was out riding today. I think part of the issue comes from the fact that the DA* line is weather sealed, and to most of us, this implies a certain level of ruggedness. Unfortunately, this isn't the case at all for the DA* 50-135mm. Case in point, the focus mechanism takes over SEVENTEEN turns of the screw-drive to go from close focus to infinity. That's right, OVER SEVENTEEN! Compare this to my F 35-70mm, which requires less than 3 turns. Or the WR kit lens, which requires 5.5 turns. Obviously, by making the focus drive in the 50-135mm use 17+ turns, Pentax drastically reduced the amount of torque needed to drive the focus mechanism, but they probably also made the threads in the mechanism very thin and delicate. Any jam in this movement (whether from heat/cold expansion or vibrations) would cause the micro motor to work harder than intended, eventually burning it out. This may be what causes the occasional funky focusing noises.

Of course, I'm theorizing here. But OVER SEVENTEEN TURNS! That speaks volumes...
03-19-2010, 12:12 PM   #21
Pentaxian




Join Date: Oct 2006
Location: Chicago suburb, IL, USA
Posts: 1,535
I've had the DA* 50-135 since about a month after introduction, and it works fine. I'd estimate about 5000 shots with it on 4 bodies.

Scott
03-19-2010, 01:24 PM   #22
Veteran Member
tomtor's Avatar

Join Date: Apr 2008
Location: Netherlands
Posts: 382
My copy is about 15 months old, no problems, but I don't use it very much.

It's a big lens, I often use my FA77 because it's has ideal dimensions.
03-19-2010, 01:27 PM   #23
Pentaxian
aleonx3's Avatar

Join Date: Jul 2007
Location: Brampton, Ontario
Photos: Gallery | Albums
Posts: 3,888
I also have this lens for over a year now - it is only used indoor for events (wedding, dinner etc.). So far it is doing its job - knock on wood.

03-20-2010, 07:28 AM   #24
Veteran Member
rustynail925's Avatar

Join Date: Aug 2009
Location: Philippines
Photos: Gallery
Posts: 1,552
Original Poster
So far the statistics says about
69% - Good
31% - Trouble
03-20-2010, 07:32 AM   #25
Pentaxian
aleonx3's Avatar

Join Date: Jul 2007
Location: Brampton, Ontario
Photos: Gallery | Albums
Posts: 3,888
QuoteOriginally posted by rustynail925 Quote
So far the statistics says about
69% - Good
31% - Trouble
@Rustynail, I have both DA* 16-50 and 50-135, but I only put in one vote, should I put in two? Also, both of them are good so far, snappy but quiet with SDM motor.
03-20-2010, 07:33 AM   #26
Veteran Member
GoremanX's Avatar

Join Date: Dec 2009
Location: Georgia, VT
Photos: Albums
Posts: 1,653
QuoteOriginally posted by aleonx3 Quote
@Rustynail, I have both DA* 16-50 and 50-135, but I only put in one vote, should I put in two? Also, both of them are good so far, snappy but quiet with SDM motor.
this thread is specifically about the DA* 50-135mm, which I think is a great idea since other threads always deal with every SDM lens. Besides, you can't vote twice.
03-20-2010, 08:35 PM   #27
Forum Member




Join Date: Jun 2008
Location: Philippines
Posts: 99
Mine is slightly more than a year old and works perfectly. No need to "wake up" the AF even after storing it.
03-20-2010, 08:40 PM   #28
Senior Member
Itai's Avatar

Join Date: Sep 2009
Location: Montreal
Photos: Gallery
Posts: 211
The poll system won't let me answer twice! Why because I had the SDM of the 50-135mm F2.8 fail completely. I sent the lens to repair. They sent me one with a new serial number (3 months later!) and I have not had a problem since.

- Itai
Neoluminance | Fine Art Photography by Itai Danan
03-20-2010, 09:22 PM   #29
Veteran Member
rustynail925's Avatar

Join Date: Aug 2009
Location: Philippines
Photos: Gallery
Posts: 1,552
Original Poster
Voting once and posting that you had 2 failed 50-135 is enough since you cant vote twice
03-22-2010, 12:21 AM   #30
Veteran Member
Christopher M.W.T's Avatar

Join Date: Jun 2009
Location: Geelong, Victoria, Australia
Posts: 1,689
Well my SDM hasn't actually failed, I could confirm the motor itself is working, something else went amiss.
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!
da*50-135mm, da*50-135mm f2.8 sdm, f2.8, k-mount, owners, pentax lens, sdm, slr lens
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
50-135mm SDM problem not a myth bng4bk Pentax SLR Lens Discussion 13 10-13-2010 07:56 AM
Uh oh, I think my 17-70mm SDM is having problems Big G Pentax SLR Lens Discussion 30 02-17-2010 02:23 PM
More SDM problems PentaxPoke Pentax SLR Lens Discussion 128 02-08-2010 06:22 AM
Is there alot of problems with the SDM AF motor? NorthPentax Pentax SLR Lens Discussion 9 01-30-2009 12:29 PM
For Sale - Sold: Pentax 50-135mm SMCP-DA* 50-135mm f/2.8 ED IF SDM mmzymxf Sold Items 1 10-28-2008 01:01 PM



All times are GMT -7. The time now is 11:22 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