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11-05-2008, 06:23 PM   #1
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I am looking for some advice.
I am becoming rather frustrated with the focus results using my 50-135 on K10d.
I have tried a number of shots, handheld and on tripod, and am findingthat focus is allover the place.
Tried other lenses (55-300, 50-200 and Sigma 17-70) with great results.
Hence, I dont feel the camera is at fault, but am wondering why the DA*50-135 is the worst (most shots, not all)

Should I send camera and lens in for testing or callibrating or whatever.
Any thoughts would be greatly appreciated.

Could it be me, getting older and wearing glasses etc

Examples :1 Fuschia : DA55-300.

2. Pine Tree : Taken with 50-135,103mm, used focus signal in camera (beep) and SR switched on. N0 wind whatsoever)

3. Aerial etc : Taken with 55-300 on the same conditions @55mm

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Last edited by Bramela; 11-05-2008 at 06:30 PM.
11-05-2008, 08:21 PM   #2
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No doubt about it there is something wrong with your lens. I have the same combo of K10 and 50-135 and it is a stellar performer. If most of your shots are like that, there has to be some sort of focus problem, maybe ff/bf. Maybe if you can send it it or exchange it.

I don't know much about the technicality but someone will chime in soon enough. I doubt it has anything to do with your camera because shot 1 and 3 look just fine. Hope you get it worked out!
11-05-2008, 09:40 PM   #3
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Thanks, for that, but then again.... if what you say is correct, thats a bit of a worry.
Perhaps a few others might chime in with their thoughts.
I'll keep you posted.
Thanks again.
11-05-2008, 11:07 PM   #4
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If you are looking for a second opinion, then I'll be happy to tell you that the 2nd photo is bad.

11-05-2008, 11:23 PM   #5
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How long did it take you to work that out
Funny thing, I must agree with you on that one!
11-06-2008, 06:54 AM   #6
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WOW!! That is headache inducing. I have the same setup and the 50-135mm is the best lens in my bag. If that is a recent purchase I'd return it, if not I'd be getting it fixed ASAP.
11-06-2008, 10:08 AM   #7
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I'd also say it's the lens if your other lenses are working okay. I used my 50-135 on both my K10D and K20D and it's been one of my most consistent performers, always dead on.

11-06-2008, 11:26 AM   #8
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invest in 50-135 repair

I had both lenses at the same time. but on a K20D, not sure if they behave differently on a K10D or not.

The 55-300 is really a great lens, and I was pleased with its performance.... but the 50-135 handily beat the 55-300 (and that's me enlarging and resampling the 50-135 to yield the same size as the 55-300) I would go out and shoot the same things with each lens, and compare the shots up to 135, then enlarge the 50-135 to match the 55-300 between 135 and 300 and the 50-135 beat it out every time. I think you are really missing out on a fabulous lens (50-135) if you don't ask for a replacement or send it in for repair. use the 55-300 in the meantime, so at least you can still shoot nicely until it is back...
11-06-2008, 08:30 PM   #9
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My first copy of 50-135mm I purchased early this year, but it was extremely inconsistent AF, and what was in focus, showed absolutely nothing even remotely close to what everyone loved this lens for - colors, sharpness, beautiful bokeh. Needless to say, I returned it with in few days. And from what I've seen this year, it is very rare for this lens.

Early this week, I finally bought another one, arrived today. Late and dark, but I must say, with K10D - focus is spot on around the house objects, smooth and fairly quick too.

So as mentioned above, if you still have time, return/exchange it!

11-06-2008, 11:11 PM   #10
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The 50-135 is probably the best piece of glass that I own, bar none. It is spectacular performance for a 3:1 zoom, and fast too. Get it replaced/fixed.
11-07-2008, 12:56 PM   #11
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Thanks for all the input. I most certainly will be pursuing this matter forthwith.
I feel that, given all the excellent reports I have read about this lens, , this one is just not up to expectations.
Thanks all!

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