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08-16-2010, 07:01 PM   #496
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Ok...it was a 2 Kit lens consisting of DAL 18-55mm F3.5-5.6 AL and DAL 50-200mm F4-5.6 ED. The pic i attached prior was the 50-200mm lens.

08-16-2010, 07:12 PM   #497
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QuoteOriginally posted by mcpxr Quote
Ok...it was a 2 Kit lens consisting of DAL 18-55mm F3.5-5.6 AL and DAL 50-200mm F4-5.6 ED. The pic i attached prior was the 50-200mm lens.
And this thread is for the DA* 16-50mm... what are you missing?
08-18-2010, 11:06 PM   #498
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ok...sorry...newbie here and new dslr owner. Saw SN on lens and was curious. I'll look for correct thread. Thx.
08-19-2010, 12:16 AM   #499
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QuoteOriginally posted by mcpxr Quote
ok...sorry...newbie here and new dslr owner. Saw SN on lens and was curious. I'll look for correct thread. Thx.
There probably isnt a thread for your lenses. This thread was created specifically because the DA* 16-50 has had QC issues and we're trying to figure out if there's a serial number pattern to the issues. Overall, it seems like its pretty random.

08-19-2010, 07:39 AM   #500
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How about the frequency of issues on the DA* 50-135?
- I have seen compains elsewhere, but that might have been a single incident?
08-29-2010, 11:57 PM   #501
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DA* 16-50mm
S/N 9031541 has SDM failure
08-31-2010, 02:16 AM   #502
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S/N 9020679
I think the SDM is slow, but what is more strange is that the minimal focus distance is about 5-10cm instead of 30cm as it should be(!)

I will probably return this piece.
09-17-2010, 08:23 PM   #503
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S/N 9041810
Ok so far I guess... I'm a noobie and its my first DA* lens, not completely sure what to expect from this line / lens. I read about the potential issues but I risked it anyway because I wanted a better than average lens since I was leaving soon for my brother's destination wedding, I had the rebate program to take the sting off the price and hoping any production problems had been worked out.
Only gripes? - I'm surprised with the build not being tougher (maybe I'm spoiled by K7?) - a few weeks in and the camera w/ lens tumbled from a bench seat 18" - 24", it wasn't a dramatic straight drop, it got tangled by the strap and clumsily tumbled so I was stunned the barrel dislodged / got off-track and stuck a bit... I gently extended and retracted the barrel, it straightened out and its working fine. Also, (even before the drop) the lens once in a rare shot seems unsure on the auto-focus and does nothing? - I guess these are more review type findings and not straight out production faults, once I get some more experience and know what I'm talking about I'll try and include it in the reviews / ratings.

09-19-2010, 10:28 AM   #504
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I've read that this lens can use screw-drive AF on older Pentax DSLR's (the *ist series). Would it therefore theoretically be possible to insulate the SDM contacts and use it in screw-drive mode on the newer bodies in case of SDM failure?
09-19-2010, 10:36 AM   #505
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My DA*16-50mm is out for service...
After more than 20k photo's, the zoom ring got more or less stuck.
I could loosen it by gently moving it back and forth.
After that the lens worked fine again, but the front lens element was loose somewhat at 16mm.

I brought it out for service, now I have to experience life without it!

- Bert
09-26-2010, 05:47 PM   #506
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My copy of the 16-50 DA* is GOOD.
s/n 9032147
I use it all the time; it's a beauty.
Having said that, I'm tired of lugging it, and am in the market for the 21mm f3.2!
09-27-2010, 09:29 AM   #507
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I got a good one from SRS No. 9031276 I thought my 50-135 was my best lens but now this one is used most, Superb.Thanks SRS.
09-30-2010, 02:36 AM   #508
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My copy, 9030148, which I purchased from B&H, is also good after 1.5 years as my main lens
10-02-2010, 05:58 AM   #509
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I have read much of this looong thread since I just purchased the 16-50mm DA* lens from Amazon. I have to say that the preliminary photos have been very impressive, esp. color and center sharpness. However, after reading this thread, I looked back at some calibration images and saw this (16mm F2.8):

All sizes | grid | Flickr - Photo Sharing!

As you can see, there is definite softness on the right side, more at the bottom, even accounting for the uneven lighting. The left side looks great to me. This apparent de-centering defect seems to be a common problem with this lens though it resolves at narrower apertures. The lens appears to be in great shape other than this one flaw.

So I guess my question to those who have more experience with this lens and the QC issues is should I exchange the lens for a new one or would this one flaw still qualify the lens as a relatively "good copy"?

Oh, and the SN is 9043508 if that means anything.
10-09-2010, 07:44 AM   #510
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2nd failure S/N 9023660

Sadly facing the same problem that forced me to send the lens back to Japan 2 years ago - the zoom has jammed. I'm pretty sure this is the result of sealing rings coming loose. It's a shame - I have been very happy with the optical performance and range of this lens since it was fixed last time. But that required 3 months in Japan, although it was at least under warranty.

So it will have to go back again. A definite design problem - this has been reported by a number of users.
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