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03-26-2010, 11:26 AM   #1
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K200D + 16-45mm AF accuracy

After months of deliberations and try outs, I got this copy of Pentax 16-45mm (the second one I'm trying--the first had some bubbles in the glass, and I returned it)... Optically seems to be excellent: no competition between it and the kit lens. However, most of the time my camera is unable to confirm focus in AF for focal lengths between 16 and 20mm and for relatively distant objects (that practically require infinity). 'Sub-infinity' AF seems to work even between 16mm and 20mm.
Not a big deal for me, but I'm wondering... I suspect the problem is the sluggish AF system of my K200D. What do you think? Any similar experience? (I've found a thread with a similar problem but with something graver in addition: poor optical quality, which isn't the case with my lens.) THANK YOU.


Last edited by causey; 03-26-2010 at 11:38 AM.
03-26-2010, 12:27 PM   #2
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I have the K200D and the 16-45. Got no problems w/ focusing. The IQ of the 16-45 @f4 is better than the kit. Theres not much of a difference when both stop down.
03-27-2010, 01:39 AM   #3
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I had the focus confirmation problem with anything between 16-28 mm at any distance beyond a few metres. I sent it back and am still waiting for it to come back from Japan.

I did however manager to take a lot of good shots with the K-m kit lens after having the camera serviced by CR Kennedy in Melbourne. I would not hesitate to recommend them.

Send the lens back or try it another body if you can, as I did to make sure it is not your camera.
03-27-2010, 01:54 AM   #4
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I don't own the lens but have thought about purchasing it. I own the K200D and I would say it is not the lens but the body. I'm yet to confirm this but my guess is the body needs to be configured to the lens.

From what I have read, all this talk about bad copies of lenses actually comes down to the body. I've been trying to get into the K200D Debug mode recently with poor results.

03-27-2010, 04:12 AM   #5
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Thank you for the answers.
I too suspect it's the body. I tried two copies of Tamron 17-50mm before this Pentax, and they frontfocused--the problem is pretty common to the K200d+Tamron 17-50mm. I had the impression that the frontfocusing was due to the K200d's sluggish AF, which was unsuccessfully struggling to achieve focus.
I got into the debug mode, but I'm not comfortable using it: you need to leave the camera in the debug mode and make the adjustments after changing the lenses, which takes some time.
Anyway, I'm trying the lens with a friend's K-m in a few hours. (Depending on the result, I'm going to try the debug mode for this lens too.)
03-27-2010, 04:30 AM   #6
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I'm having great trouble getting into Debug mode. I'd rather try this than send my camera away.
03-27-2010, 04:45 AM   #7
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I'll tell you what I did to get into debug mode, but later today, because I have to remember the process, and now I have some work to do. (It was hard to find the right trick--many advices online, only one worked for me--but after that, not very difficult.)
03-27-2010, 05:57 AM   #8
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I was considering the Tamron 17-50 at first but there are lots of complaints regarding the FF issues. When i uprgade my camera thats the time i will buy the Tamron 17-50..

03-27-2010, 06:03 AM   #9
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QuoteOriginally posted by rustynail925 Quote
I was considering the Tamron 17-50 at first but there are lots of complaints regarding the FF issues. When i uprgade my camera thats the time i will buy the Tamron 17-50..
It's a shame, because otherwise K200d is such a wonderful camera. If it had a better AF system and better high ISO capabilities, I would not upgrade in 10 years.
About the Tamron: having compared both lenses, I can say that Tamron is sharper (and really sharp wide open), but I prefer Pentax's colors (and colors can't be modified in the desired direction without a lot of work in PP) and the 16mm.
03-27-2010, 06:36 AM   #10
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Yeah I really like my K200D except for its poor AF w/c hunts in lowlight. For now ill just wait for the next body maybe a K7 w/ Kx sensor or something evil like the samsung NX10 body.
03-27-2010, 09:16 AM   #11
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I couldn't wait, so I entered into debug mode and made adjustments: the AF begins to function after a correction of +150! So, I thought, let's try another lens to see if it's the camera or the lens. I tried the kit lens: the correction gives it a severe frontfocus.

And this isn't all. I noticed that, before correction, at 16mm pictures were really soft, especially in the background even in MF. (I know 16mm is 'supposed' to be softer, but at f5.6 it's about as my kit lens at 18mm, f4) At 18mm, things are getting much better in MF (not in AF though). After the +150 correction, the Pentax 16-45mm behaved admirably at 16mm (much increased sharpness in general and clarity of background), but from 18mm the quality of the pics begin to suffer (especially the backgrounds). I don't know what to make of this; in any case, I'm going to return the lens, for sure.

Now, about the debug mode. I found a little program online (no longer available) that allowed me to create a file for k200d (which I can send you by email--I tried to upload it here, it doesn't work). I put that file on my card, then, with the card door open, I powered the camera while pressing the "menu" button. Then: Debug mode> press "OK" on EN ("enable")>blank shows up, another click on "menu"> go in setup menu, where the AF adjustment can be found (not visible in normal mode). Don't forget to disable the debug mode after you're don (by pressing "OK" on DIS).
03-27-2010, 10:07 AM   #12
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Debug mode wouldnt work if you use other lenses. Its not worth it IMO
Try replacing your 16-45 or the sigma 17-70.
03-27-2010, 10:17 AM   #13
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If it's a camera defect, it's worth using the debug mode; otherwise, no, since it's painful to make the corrections for every usage of a certain lens. I'm sending mine back, and I don't think I'll accept a replacement. I've had only bad lenses from prodigital2000 lately, and I suppose it has something to do with their low prices. I'm going to buy another one from amazon.
03-27-2010, 10:20 AM   #14
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Check out Adorama also. Gud luck
03-27-2010, 05:14 PM   #15
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I've tried the process before, but never got it to work. Anyway, i'll pm you my email addy.
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