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04-19-2011, 02:38 AM   #16
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I bought 16-50 & 50-135 back in september 2007 when I purchased my first Pentax digital reflex, the K10D. I haven't had any trouble with both of them.

04-19-2011, 06:48 AM   #17
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I bought a used 50-135 in Feb 2008, so it probably was manufactured around late 2007. The autofocus hesitated a bit when I first tried it out but that may have been caused by shipping and cold weather. Anyway it's been fine ever since then.
04-19-2011, 06:55 AM   #18
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50-135 lens; will hit the 2 year mark soon. So far so good. My problem is that if it does get into sdm problems down the line, I like it so much that I would just have to get it repaired or buy another one

16-50: did not have the guts to buy 2 sdm lenses...
04-19-2011, 04:11 PM   #19
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I got mine from Amazon September 3, 2008. Took 250 shots with it yesterday. No Problems. Still works great!

04-19-2011, 04:13 PM   #20
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um... the DA* 16-50.
04-19-2011, 09:52 PM   #21
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DA* 16-50 and 50-135 in early 2008, no issues with SDM, except that it is painfully slooooow.
04-19-2011, 09:55 PM   #22
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Yes. I bought both of them in November and December 2007. Neither has ever been in for repair and they are both still working.

04-20-2011, 02:01 AM   #23
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Bought my DA* 50-135mm in October 2007 and it's been acting strange for the last two years now.

When I mount it on a camera and try to focus on something it's trying to move the focus but is failing or doing it very slow ... then after a couple of moments it starts operating normally. It's a bit annoying but I got used to it because it doesn't happen all the time. Sometimes it starts focusing right away but then there are occasions when I turn the camera off and on and the lens locks up again.

I sent it back for repairs in July 2009 together with my K10D (shutter replacement) and they just looked at it and did nothing. I guess they'd have to send it to someone who does lens repairs as they're only qualified for body repairs - a bit off topic but they did that wrong too so I had to send the camera back twice because they didn't put it back together properly. Got fed up in the mean time and just bought the K-7 in August.

The 50-135 is still working as described earlier in the post and I'm fine with it. I don't want to pay for a new SDM and repairs or even a new lens. As long as it's working it's OK, I just wish Pentax would give an option in the camera settings to use the screw-driven motor for this lens.

04-20-2011, 07:18 AM   #24
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Thanks for your replies! The 50-135 seems to a great performer across the range. The 16-50 seems slightly inferior. I guess the SDM issue does get blown out of proportion online. My only gripe about the 50-135 is the AF speed. The IQ is definitely close to the best Pentax primes.

I bought the primes and the DA* zooms to determine which route I was going to go with my K5. Apart from the SDM issues, I just find the smaller primes so much more convenient. If only there were a set of DA* wide angle primes I'd jump on them today. Until such lenses exist, I think my limited primes and the 18-135 for hazardous conditions will have to suffice. I just sold my 16-50 and returned my 50-135, mainly because of bulk.

At least I know that there are good SDM lenses out there, which will affect my future SDM purchases. Thanks for contributing everyone!
04-20-2011, 10:11 AM   #25
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DA* prime will not be small too. see the DA* 55 f1.4.

To get small and beauty, you need Ltd lenses. But no WR.

I think the only WR with Ltd beauty (& size) lens is the 100mm macro WR (but it don't get the * or Ltd name).

I can only imagine people will go crazy for DA* if they were all built like the 100mm macro WR -- I would!

Lee
04-20-2011, 11:30 AM   #26
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QuoteOriginally posted by LFLee Quote
DA* prime will not be small too. see the DA* 55 f1.4.

To get small and beauty, you need Ltd lenses. But no WR.

I think the only WR with Ltd beauty (& size) lens is the 100mm macro WR (but it don't get the * or Ltd name).

I can only imagine people will go crazy for DA* if they were all built like the 100mm macro WR -- I would!

Lee
You're right Lee, they probably won't be too small. That might also depend on how fast they make the lenses too. I don't mind them to be around f2.5-f3.2 range, as long as they are wider and AF well. I think AF speed/accuracy is another thing that is making me wait on the DA* lineup before I reinvest in them. Honestly, I shoot and operate faster using my M8 in MF. I guess that also has to do with what I am used to. But AF needs for certain situations is the reason I got the K5 and the DA*s were disappointing in that regard.
04-20-2011, 01:13 PM   #27
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I have had a DA* 16-50 for slightly over two years with no problems so far. My impression is that the majority of SDM failures occurred with earlier production copies, but not exclusively. I think that one can purchase the SDM lenses with a fairly high degree of confidence now.

Rob
04-20-2011, 05:23 PM   #28
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I think SDM statistics are a lot like divorce statistics. It is the repeat offenders that really skew the numbers.
04-21-2011, 06:23 AM   #29
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QuoteOriginally posted by Rondec Quote
I think SDM statistics are a lot like divorce statistics. It is the repeat offenders that really skew the numbers.
good one!
04-21-2011, 07:55 AM   #30
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It's funny about the SDM issues. I went back in the archives here to find out when I got my 50-135, it was August 2007. I had pre-ordered it locally and it was one of the first sold in Los Angeles. I still have it, it's never had SDM issues though it's starting to look a little rough outside. For some reason, it's the one lens that gets dropped or rubs against something and the front lens cap fell apart (it's now got a generic one on it). It's been a real work-horse of a lens for me, probably my most used one, and I'm enough of a klutz that it's had some unintentional abuse. But it still keeps working, doesn't mind rain or ocean air.

I also have 2 other SDM lenses but they are much newer (DA*200 and DA*300). They are both about a year and a half old so they don't qualify here.
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