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02-12-2014, 06:48 PM   #1
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K3 and 35mm 24 backfocus - calibration software

I returned my K3 and 35mm 2.4 (both under warranty) back to CR Kennedy for backfocus alignment several weeks ago. I'm told by one of their Tech Leads that they have been waiting for some calibration software for the K3 for around two weeks now. Has anyone in Australia recently or previously sent in their K3 to CR Kennedy in Melbourne and have had their back (or front) focus fixed?

02-12-2014, 09:34 PM   #2
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Isn't this something you can do in-camera yourself?
02-12-2014, 09:37 PM   #3
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QuoteOriginally posted by Steve.Ledger Quote
Isn't this something you can do in-camera yourself?
Yes you can do it on the Micro Adjustment function, but mine has gone to +10 and there is still a backfocus. I'm keen to know if anyone if Oz has gotten their K3 FF/BF issue fixed, and did it get adjusted mechanically or via some specialised software.
02-12-2014, 10:03 PM   #4
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I have noticed some inconsistent focusing in my K3 (in a short range) too but would not know how to fix it. This thread gives me some ideas and will have a look at this over the weekend. Will post my findings if anything good comes out of it.
Cromer

02-12-2014, 10:48 PM   #5
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That's awful bad luck for a new flagship body AND the lens are faulty to degrees past what user calibration can correct?
I don't like the sound of the pretty poor excuse from CRK either, because if such software actually exists it is kind of easy to distribute electronically - so there should be no waiting.
02-13-2014, 12:23 AM   #6
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Given that these issues are usually a product of tolerance variations between lens and body, if the problem is only with the 35 f2.4, couldn't they just swap around a few copies of the 35 f2.4 until they found a sample that worked better with your K-3, and then give that lens to you?
02-13-2014, 02:14 AM   #7
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That's actually what I insisted they do. The Tech Lead said that they tested the 35mm against a K5 and noticed a BF issue on the lens, but they also wanted to test it against my K3 but can't yet until they've ascertained or fixed the K3 issue (if infact there is a BF issue on the body). I'm quite surprised that they've waited over a fortnight for that software, when they can easily download it from a corporate server. I'm not so sure if infact there is a software or the Tech Lead has just gotten fedup with me calling every week and that this is his way of getting back at me.
02-15-2014, 05:04 PM   #8
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QuoteOriginally posted by Teal Quote
Yes you can do it on the Micro Adjustment function...
May I ask how?

I bought a kit consisting of K-3 and the DA 18-135mm WR - and I don't think the photos are that sharp.

Could a lens calibration do the trick - and how do you perform this?

Thank you kindly.

02-16-2014, 06:28 PM   #9
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QuoteOriginally posted by Ztrejfer Quote
May I ask how?

I bought a kit consisting of K-3 and the DA 18-135mm WR - and I don't think the photos are that sharp.

Could a lens calibration do the trick - and how do you perform this?

Thank you kindly.
You can do it via the Custom Menu. There is a menu option there for Micro Adjustment. You can do it for individual Pentax Lenses, or one setting for all lenses.
02-17-2014, 08:21 AM   #10
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Last night I walked around and shot a few handheld test shots of snow/trees/sunset/streets/houses with my new K-3 + 50mm f/1.8. I use AF-C with single point and w/ Rear Button AF.

Given the setting sun and the fading light, I set the exposure at f/2.5 @ 1/50th sec. (allowing auto ISO to adjust for me) I took a handful of similar scenes, all near each other, and all in fading light. Total of six. To my surprise, four of the six are undeniably "blurry"! Two are tack sharp (proving that this is indeed a great little lens). And yes, I have already calibrated the lens using AF fine tune. Note again that I deliberately shot at 1/50th of a second which with modern SR algorithms is well within the bounds of what the SR should be able to accommodate.

The trouble I'm having is that it doesn't appear to be a "focus" issue (although truth be told, there appears to be "some" back focusing in two of the blurry images) but rather, my theory is that the SR mechanism/algorithms are sometimes "confused" and mess the image up. Which is to say, I am troubled by this behavior. I will be receiving some other (Limited) prime lenses later this week and will see if they too exhibit this behavior, or whether this session was a fluke, or whether it applies only to the 50mm lens.

But given a quick read of this forum, it is clear that there is "something" not quite right about SR in certain circumstances and I'm trying to get to the bottom to identify a replicable situation where the system fails.

Michael
02-17-2014, 10:34 AM   #11
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Put the camera on a tripod, disable AF, 2 second timer, focus manually via Live View (focus peaking enabled helps), take some shots. Repeat with AF and see if there is a difference. Adjust AF via in-camera corrections if necessary.

Jack
02-17-2014, 10:48 AM   #12
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QuoteOriginally posted by jbinpg Quote
Put the camera on a tripod, disable AF, 2 second timer, focus manually via Live View (focus peaking enabled helps), take some shots. Repeat with AF and see if there is a difference. Adjust AF via in-camera corrections if necessary.
yeah. done that already. First thing I always do with any new gear.
One common denominator of the images I shot last night was that the focus distance was much greater than just "nearby" -- ranging from 50ft to 200ft or more. (in other words: classic landscapes)
And don't forget, two of the images were "spot on" using the same technique and same settings (i.e. spot focus on a window frame for example).

As a side note, I have not seen this behavior (yet) indoors with any "nearby" images using this lens.

Michael
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