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04-27-2008, 04:49 AM   #1
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this time i am sure my 16-45 is a bad copy

we talked about this issue earlier
https://www.pentaxforums.com/forums/pentax-slr-lens-discussion/23443-do-you-h...s-16-45-a.html
i just test my lens with the focus chart and newspaper.
here are the link for 16 20 34 40 45 mms


IMGP1617 on Flickr - Photo Sharing!
IMGP1618 on Flickr - Photo Sharing!
IMGP1621 on Flickr - Photo Sharing!
IMGP1619 on Flickr - Photo Sharing!
IMGP1620 on Flickr - Photo Sharing!


is it possible to adjust this lens??? i think the problem is back-focussing.
i know a man who is very capable of solving technical problems. do you think he can handle it adjusting the settings of the k10d or lens????
thanks
halil

04-27-2008, 05:37 AM   #2
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Un fortuntely, i cant tell from the size of the photos you posted.

I have noticed on my 16-45 some BF issues at F4 and on, some, very close up subjects. Its fine on
normal shots.

Dave
04-27-2008, 05:57 AM   #3
hll
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for bigger size where should i upload the photos???
04-27-2008, 06:18 AM   #4
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Anywhere but flickr.

Try photobucket.com, hasn't let me down.

04-27-2008, 06:44 AM   #5
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And I think you are suppost to have the test page cover the whole frame
04-27-2008, 06:50 AM   #6
hll
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halilonsel - Photobucket - Video and Image Hosting
04-27-2008, 01:37 PM   #7
hll
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ok, you are right.
i think it is better now, here you go
halilonsel - Photobucket - Video and Image Hosting
you will see five photos with cropxxmm.
thanks
halil
04-27-2008, 01:48 PM   #8
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It does look like a lousy copy to me, however I'd rather see something properly exposed before I give my judgment.

04-27-2008, 01:55 PM   #9
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i used spot metering for these shots and i used tripod.
i don't want to change the discussion topic but i think my k10d or my lenses don't meter the light
perfectly!!! ((
ok, let's forget that and discuss about the focus problem
04-27-2008, 07:19 PM   #10
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I had to send my K10D in for a focus calibration. It had a backfocus issue, but only from about 40mm down. I noticed it the worst on my 31mm.

My advice is to borrow another camera body, preferably a different model like a K100D or *ist D or something. If it works fine on another camera, then you need to send your K10D in for calibration.
04-27-2008, 07:38 PM   #11
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yeah i can find k100d and istd.
tom, i have a question, if my k10d is not calibrated well, why do i have perfect photos from FA 50 1.7 or 18-55???? can you please eloborate on it??
thanks halil
04-28-2008, 03:55 AM   #12
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hey i tested my 16-45 with my friend's istd. the results are really fine to me.
so what should i do now??
do you think is it possible to calibrate my cam without having problems with my other lenses???
thanks
halil
04-28-2008, 04:08 AM   #13
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QuoteOriginally posted by hll Quote
hey i tested my 16-45 with my friend's istd. the results are really fine to me.
so what should i do now??
do you think is it possible to calibrate my cam without having problems with my other lenses???
thanks
halil
Sorry, you will have to send the body it to Pentax for calibration. There is a hack to do an adjustment, but I didn't want to chance it. If your nearest Pentax repair center is like the one in the US, you shouldn't be more than 2 weeks without your camera.
04-28-2008, 04:15 AM   #14
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QuoteOriginally posted by hll Quote
yeah i can find k100d and istd.
tom, i have a question, if my k10d is not calibrated well, why do i have perfect photos from FA 50 1.7 or 18-55???? can you please eloborate on it??
thanks halil
I cannot answer this question for you. I know what you are saying, because I had the same issue. All I know is that some lenses were off focus a little, and some were off focus a LOT! Pentax fixed it for me.

My K10D seemed to focus fine on the 18-55 kit lens, 50-135, and most others. But it was a bit off on the 35/2 and really far off on the 31 Ltd. I tried the 31 on another body (*ist DL) and the pictures were fine. When the K10D body came back from Pentax, the 31, 35, and all were working just fine.
04-28-2008, 04:33 AM   #15
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QuoteOriginally posted by TomInJax Quote
I cannot answer this question for you. I know what you are saying, because I had the same issue. All I know is that some lenses were off focus a little, and some were off focus a LOT! Pentax fixed it for me.

My K10D seemed to focus fine on the 18-55 kit lens, 50-135, and most others. But it was a bit off on the 35/2 and really far off on the 31 Ltd. I tried the 31 on another body (*ist DL) and the pictures were fine. When the K10D body came back from Pentax, the 31, 35, and all were working just fine.
Di you have to send in ant lenses. Pentax Canada says nothing wrong with my camera. But they also say if problem persists, which it is, to send in lenses it does it with.

Dave
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