Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
10-09-2013, 12:40 PM   #1
Site Supporter




Join Date: Jan 2013
Location: Northern Wisconsin
Posts: 703
DA*16-50 redesign?

It has been mentioned in a couple places on the forum that after many early focus failures with the early releases of the DA* 16-50 lens that Pentax "made some improvements" to or somehow corrected the failure prone components. Does anyone have any actual evidence of this actually happening? I'd really like to know as I am very interested in the lens but am reluctant to spend $1,000 for something that is likely to fail.

Thanks, Bob

10-09-2013, 01:11 PM   #2
Pentaxian
carrrlangas's Avatar

Join Date: Mar 2012
Location: Joensuu (Finland)
Photos: Gallery
Posts: 1,750
Originally, it was a comment from a German Pentax engineer that said de parts prone to failure had been changed in the SDM mechanism. So the problem shouldnīt existe for 2012 and onwards produced lenses
10-09-2013, 01:34 PM   #3
Pentaxian
aleonx3's Avatar

Join Date: Jul 2007
Location: Brampton, Ontario
Photos: Gallery | Albums
Posts: 3,888
I actually do have the early version of the lens and the SDM motor was replaced by Pentax Canada repair centre; according to the repair shop, the SDM motor component installed in my lens was an updated design (with different/better material). I don't have any problems since then. While I can understand your concern I don't think the new lenses manufactured within the last year will have the same problem as the early production version.
10-09-2013, 01:35 PM   #4
Banned




Join Date: Jun 2012
Location: NY/Germany
Posts: 1,183
We're still awaiting any sort of confirmation. Note: we've been told by people seeding the forums that their SDM repairs were carried out using "redesigned parts" for four years now, and no one has ever been able to confirm this, nor has Pentax.

The flaw is the complete drive design.

Not only that, with the 16-50, decentered elements is a concern (two test copies I had were both decentered) and many have reported that as a problem.

My advice is to never buy one new. Buy a used one and convert it to screw drive only. Make sure the elements aren't badly decentered before you buy. Then you'll be golden, but don't use it too much at 16mm. The optical quality below 18mm is not very good and overall, it's not the best lens for optical quality between it, the Tamron, and Sigma.

10-09-2013, 01:43 PM - 1 Like   #5
Administrator
Site Webmaster
Adam's Avatar

Join Date: Sep 2006
Location: Arizona
Photos: Gallery | Albums
Posts: 43,118
There haven't been many complaints about failures in the part year. If there were issues, we would have seen lots of threads, as hundreds of 16-50s were sold last fall to our members (during the black Friday sale)

Adam
PentaxForums.com Webmaster (Site Usage Guide | Site Help | My Photography)



PentaxForums.com's high server and development costs are user-supported. You can help cover those costs by donating. Or, buy your photo gear from our affiliates, Adorama, B&H Photo, or Topaz Labs, and get FREE Marketplace access - click here to see how! Trusted Pentax retailers:

10-09-2013, 01:44 PM   #6
Site Supporter




Join Date: Jan 2013
Location: Northern Wisconsin
Posts: 703
Original Poster
QuoteOriginally posted by carrrlangas Quote
Originally, it was a comment from a German Pentax engineer that said de parts prone to failure had been changed in the SDM mechanism. So the problem shouldnīt existe for 2012 and onwards produced lenses
Yes! That is exactly what I remember seeing and it sounds great however..... did that really happen?
10-09-2013, 01:47 PM   #7
Site Supporter




Join Date: Jan 2013
Location: Northern Wisconsin
Posts: 703
Original Poster
QuoteOriginally posted by aleonx3 Quote
I actually do have the early version of the lens and the SDM motor was replaced by Pentax Canada repair centre; according to the repair shop, the SDM motor component installed in my lens was an updated design (with different/better material). I don't have any problems since then. While I can understand your concern I don't think the new lenses manufactured within the last year will have the same problem as the early production version.
Now that sounds more like a "confirmation"....
10-09-2013, 01:50 PM   #8
Site Supporter




Join Date: Jan 2013
Location: Northern Wisconsin
Posts: 703
Original Poster
QuoteOriginally posted by snake Quote
We're still awaiting any sort of confirmation. Note: we've been told by people seeding the forums that their SDM repairs were carried out using "redesigned parts" for four years now, and no one has ever been able to confirm this, nor has Pentax.

The flaw is the complete drive design.

Not only that, with the 16-50, decentered elements is a concern (two test copies I had were both decentered) and many have reported that as a problem.

My advice is to never buy one new. Buy a used one and convert it to screw drive only. Make sure the elements aren't badly decentered before you buy. Then you'll be golden, but don't use it too much at 16mm. The optical quality below 18mm is not very good and overall, it's not the best lens for optical quality between it, the Tamron, and Sigma.
I'm just not interested in screw drive technology....

10-09-2013, 01:52 PM   #9
Pentaxian
carrrlangas's Avatar

Join Date: Mar 2012
Location: Joensuu (Finland)
Photos: Gallery
Posts: 1,750
QuoteOriginally posted by woodywesty Quote
I'm just not interested in screw drive technology...
Why?
I think itīs great they still use it. itīs cheap, light, easy to fix or replace.. Extremely reliable..
10-09-2013, 01:57 PM   #10
Site Supporter




Join Date: Jan 2013
Location: Northern Wisconsin
Posts: 703
Original Poster
QuoteOriginally posted by Adam Quote
There haven't been many complaints about failures in the part year. If there were issues, we would have seen lots of threads, as hundreds of 16-50s were sold last fall to our members (during the black Friday sale)

That's good to know. I have no idea how many of these lenses have been sold and that there were "hundreds sold" on Black Friday gives me some confidence.

I tried to call Chuck at B&H earlier today but couldn't get a hold of him. I wanted to chat "off line" about the lens and not put B&H in an awkward position. So I finally just posted the question to him on the forum. Wonder if there's a way to pull the request?? Anyway, I'm going to take a chance and order the lens in the morning and then try and get an idea when the K3's will be available.

Thanks Adam...
10-09-2013, 02:03 PM   #11
Site Supporter




Join Date: Jan 2013
Location: Northern Wisconsin
Posts: 703
Original Poster
QuoteOriginally posted by carrrlangas Quote
Why?
I think itīs great they still use it. itīs cheap, light, easy to fix or replace.. Extremely reliable..
Well.... having no way to see, handle or hear the lenses in action I can only make decisions based on reviews and the many comments on the Forum that while the screw drives are dependable they are slow and noisy. Both are somewhat subjective and there is no actual comparative data between the two that I've seen. In any event I don't want noisy.

Do Canon and Nikon still use the screw drive system? (I actually don't know)
10-09-2013, 02:49 PM   #12
Veteran Member
stormtech's Avatar

Join Date: Jan 2011
Location: In the boonies (NW Penna)
Photos: Gallery | Albums
Posts: 5,670
Funny - I also bought a DA* 16-50 during last years Black Friday sale in hopes of getting a newer one that would hopefully have the redesigned parts. When received it said "HOYA" on it - returned it right away.
10-09-2013, 02:57 PM   #13
Pentaxian
aleonx3's Avatar

Join Date: Jul 2007
Location: Brampton, Ontario
Photos: Gallery | Albums
Posts: 3,888
I use the two lenses (DA*16-50 and DA*50-135) a lot for event photography. Both lenses are great IQwise, and both lenses have been replaced with newer SDM motors and still functioning today. In the early introduction of the lenses, some people had de-centering problems with the DA*16-50. There are times that I thought I might have that problem especially with the 16-50 lens, and I find it hard to test that particular problem especially if the problem is slight and not so obvious. In any case, if you encounter such a problem with the new lens you should be able to get it corrected within the warranty period.

One thing I noticed that the price of the new DA* 16-50/50-135 have gone up a lot since the early introduction year. So, I guess it pays to be an early adopter in this case despite the problems we encountered initially.

Last edited by aleonx3; 10-09-2013 at 03:14 PM.
10-09-2013, 03:01 PM   #14
Pentaxian
aleonx3's Avatar

Join Date: Jul 2007
Location: Brampton, Ontario
Photos: Gallery | Albums
Posts: 3,888
QuoteOriginally posted by stormtech Quote
Funny - I also bought a DA* 16-50 during last years Black Friday sale in hopes of getting a newer one that would hopefully have the redesigned parts. When received it said "HOYA" on it - returned it right away.
According to Pentax repair, the 'defective' component of the SDM motor was corrected at the very early stage, so the lenses produced later could still have Hoya name on it. By the way, I am not trying to promote it.. just saying based my experience...
10-09-2013, 03:08 PM   #15
Site Supporter




Join Date: Jan 2013
Location: Northern Wisconsin
Posts: 703
Original Poster
QuoteOriginally posted by stormtech Quote
Funny - I also bought a DA* 16-50 during last years Black Friday sale in hopes of getting a newer one that would hopefully have the redesigned parts. When received it said "HOYA" on it - returned it right away.
Where exactly did it sat "Hoya" ?
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!
k-mount, lens, pentax lens, slr lens
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
For Sale - Sold: Pentax DA* 16-50,DA* 60-250, D FA 50, O-GPS1... etc. Harald Sold Items 2 07-22-2013 04:02 PM
Shootout #2 - DA 15 Ltd / Tamron 17-50 @17 / DA* 16-50 @16 / Sigma 10-20 @16 EarlVonTapia Pentax SLR Lens Discussion 4 06-23-2013 10:17 PM
For Sale - Sold: K-7, K2000, DA*300, DA*16-50, DA 70 ltd, DA 14, K28 and A24 Duplo Sold Items 17 03-31-2012 03:33 AM
DA 17-70 + DA*60-250 or DA*16-50 + DA*50-135 Cambo Pentax SLR Lens Discussion 54 01-01-2011 12:12 AM
Wide-to-medium Tele zoom (DA 16-45mm, DA* 16-50 or DA 17-70mm?) tlwyse Pentax SLR Lens Discussion 5 07-08-2009 06:36 AM



All times are GMT -7. The time now is 09:52 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