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01-05-2011, 02:19 AM   #1
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K5 and DA*50-135mm

I was just wondering, any K5 users out there, with a DA*50-135 lens? I am having focus problems and finding sharpness is hard to achieve even with AF fine adjustment in the menu. I never had any problem with K20d. In fact it was a brilliant combination.
Anybody finding this same problem. What do you recommend?

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01-05-2011, 03:15 AM   #2
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mine seems ok, going out with it soon so will do more shooting and let you know.
01-05-2011, 03:17 AM   #3

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I hev not tried it on my current K-5 but I will go out this weekend with this combination. Maybe you can do some lenscalibration to correct it.
01-05-2011, 05:18 AM   #4
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I had similar problems with my K5 and 18-135. Check out page 75 in the K5 manual. Whole bunch of stuff listed that can give focusing problems. Things are getting better as I get used to fussy focusing but Pentax does need to do a fix.

01-05-2011, 05:29 AM   #5
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I have the same combo, and I to had some problems.
First of all it it didn't seem to adjust focus at all, as there wasn't enough power. So I had to give it som manual help.
Unfortunately my K-5 is in for a repair (FF issue), so I haven't dug further into the problem.
Let us know if you find out more about it.

And I totally agree with you about the K20 and 50-135. That was one of my favourites.
01-05-2011, 06:04 AM   #6
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I have used the DA* 50-135 (& DA* 16-50) on two K5s without focussing difficulties. I did, however, discover that DA* lenses are especially sensitive to grime on the contacts on the lens mount. This can lead to overexposure errors at rapid frame rates - typically with one image in four or five being about a stop or more overexposed. Clutch-driven lenses were not affected. I found that cleaning the contacts on the camera and the lenses resolved the problem.
01-05-2011, 07:29 AM   #7
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just make calibration it will help (;
01-05-2011, 08:56 AM   #8
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No problems here. Haven't tried the combo in dark environments though.

01-05-2011, 12:32 PM   #9
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Thanks all, for your comments, I will follow the advice given and get back to let you know how I get on.

01-05-2011, 01:12 PM   #10
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A BF/FF test with my DA*50-135. It seems all okey. Focus on the "OK" button. Not bad.. Isn't it?

Also 2 more recent shots with DA*50-135



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01-05-2011, 09:11 PM   #11
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mine combination of k-5 and da* 535 is "fine". Tackle sharp from 70--120, very tiny back focus at 50 and 135... that's the problem with zoom lenses, you can never find a good constant adjustment throughout the zoom range...

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