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07-14-2010, 07:36 PM   #1
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Wow, a +8 Focus Adjustment?

I've had my K-7 for over a month now and have been frustrated getting sharp photos. I learned about in-camera focus adjustments a couple of weeks ago when I put a +5 adjustment across the board on all my lenses, but found my photos were still not sharp.

Tonight I spent a couple of hours adjusting all my lenses individually and found that most needed a +8 adjustment (my DA* 50-135 needed +10!). Wow, I hope this does it.

Is this common for K-7 owners?

Thanks in advance for any thoughts you may have.


Last edited by iocchelli; 07-14-2010 at 08:21 PM.
07-14-2010, 09:30 PM   #2
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No, Not in my experience but I'm just one person. Perhaps I got lucky. Might I ask How you did your tests?

07-14-2010, 09:34 PM   #3
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QuoteOriginally posted by JeffJS Quote
Might I ask How you did your tests?

Did you force autofocus to the center dot during your tests? I think +8 for every lens means there's something that consistantly throwing your camera off (at least where you are testing it).

My cam is much better at AF when it is only thinking about the center dot
07-14-2010, 09:35 PM   #4
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You can also go to debug menu and set there -80 um (it is same as +8 as I understand).
So you'll have more adjustable range in normal custom functions menu



07-14-2010, 09:53 PM   #5
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QuoteOriginally posted by JeffJS Quote
No, Not in my experience but I'm just one person. Perhaps I got lucky. Might I ask How you did your tests?

I chose three targets, shot them at varying distances and focal lengths (most of my lenses are zooms), and at +6, +7, +8, +9 and +10 adjustments. Then I uploaded all hte photos to my computer and checked the results to see which setting was best.

After I settled on the adjustments, I took more photos of various subjects and found all my lenses to be much, much sharper (very sharp).

Not the test I've read about, but it worked really well and the K-7 seems to be calibrated much better now.
07-14-2010, 09:53 PM   #6
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QuoteOriginally posted by paperbag846 Quote
Did you force autofocus to the center dot during your tests? I think +8 for every lens means there's something that consistantly throwing your camera off (at least where you are testing it).

My cam is much better at AF when it is only thinking about the center dot
Yup, sure did. I'm currently only using center dot focus.
07-14-2010, 09:54 PM   #7
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QuoteOriginally posted by Zebooka Quote
You can also go to debug menu and set there -80 um (it is same as +8 as I understand).
So you'll have more adjustable range in normal custom functions menu

That's sounds very interesting. Do you have more information about this? Thanks!
07-14-2010, 10:03 PM   #8
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I would say if "all" your lenses needed adjustment, it's not the lenses...I would call Pentax and get the camera fixed.

07-14-2010, 10:04 PM   #9
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QuoteOriginally posted by mtroute Quote
I would say if "all" your lenses needed adjustment, it's not the lenses...I would call Pentax and get the camera fixed.
Thanks mtroute. Yes, it is every lens. I think you are right - I am going to take it in.
07-14-2010, 10:23 PM   #10
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Is the diopter in the viewfinder set correctly?
07-14-2010, 10:33 PM   #11
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QuoteOriginally posted by alohadave Quote
Is the diopter in the viewfinder set correctly?
that would not effect AF however...you would just see a blurry viewfinder with focus confirmation indicator light...
07-14-2010, 10:48 PM   #12
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QuoteOriginally posted by mtroute Quote
that would not effect AF however...you would just see a blurry viewfinder with focus confirmation indicator light...
Agreed. For me, when the focus indicator lights up, I am seeing an in-focus image.

I've been testing all night on various subjects with all of my lenses and I think I have everything sorted out. Still, I think I may take the k-7 in to make sure there isn't something wrong with it.
07-14-2010, 10:56 PM   #13
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QuoteOriginally posted by iocchelli Quote
Agreed. For me, when the focus indicator lights up, I am seeing an in-focus image.

I've been testing all night on various subjects with all of my lenses and I think I have everything sorted out. Still, I think I may take the k-7 in to make sure there isn't something wrong with it.
At the very least, I'd use the debug mode for the universal correction and preserve the individual adjustments for specific lenses. I'd agree this is an unusually large correction. I don't have a K-7, but I've never used anything like that on the K20d or on other cameras in the debug mode. The most I've ever needed for any specific lens was +4, and for the camera in debug +2.
07-15-2010, 12:10 AM - 1 Like   #14
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Welcome to Pentax Hack

Debug mode

Debug mode is a way to get into the service menu of the camera. Unless the link site has been updated, or you haven't gone to the latest firmware, you may not be able to get in to it. Honestly, if your camera is working to your satisfaction, I wouldn't bother with it.

Better would be to use the camera and if you come to a point where you will not be using it for awhile, send it in for an adjustment. While still under warranty.

07-15-2010, 02:53 AM   #15
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QuoteOriginally posted by iocchelli Quote
...I've been testing all night...
You might want to test under daylight lighting conditions as tungsten lighting can cause af to front focus.

In any event, with such a severe degree of adjustment necessary with all lenses, I would suggest sending the camera to Pentax for calibration. The camera should not be that far off.
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