Saturday, December 16, 2006

AF Errors/Problems of the K10D

In my last post, I mentioned about the Front Focusing problem of the K10D as reported by different new K10D users over the Net. I originally expected that for anyone with more interests could search the reports by themselves. However, here is yet a comment to my last post for asking the links (of those reports):-

http://ricehigh.blogspot.com/2006/12/dpreview-puts-low-rating-on-image.html#links
(See the fourth comment)

Well, in view of this, I think a new separate Blog entry containing a few of those links would be convenient and handy for those who are really interested. Here they are (still just a few of those reports):-

1. http://forums.dpreview.com/forums/read.asp?forum=1036&message=21115135

The above user has both the K10D and K100D and found that the FF symptoms are similar for both units. This post is quite useful as pictures are posted in his post. The user also said, "The FF is slight enough with both cameras that apertures smaller than f/4 or so tend to mask it." So, this just implies the FF errors will easily show up for apertures larger than f/4! (provided that the lens attached is fast enough)

2. http://forums.dpreview.com/forums/readflat.asp?forum=1036&thread=21265823

The above case is even worse, repeatable FF problems were found with the (slow) Kit Lens! See the test shot links included in the post.

3. http://forums.dpreview.com/forums/read.asp?forum=1036&message=20995715

4. http://www.pentaxforums.com/forums/pentax-dslr-discussion/1377-k10d-front-focus-body-lens.html

5. http://www.mail-archive.com/pdml@pdml.net/msg362005.html

Well, if you really wish to see more user reports, just do a simple internet search and/or search the posts forum by forum, using their own search function. It will not be so difficult afterall! :-)

Do note that the chief engineer of the K10D development team previously disclosed in an interview with him that the AF accuracy of the K10D is the same level as the K100D. For more read on the implication of AF accuracy on a high pixel count DSLR as well as the quoted part and the source of the interview, you can read back my previous blog entry below:-

http://ricehigh.blogspot.com/2006/12/how-af-errors-can-decrease-effective.html

6 Comments:

Anonymous said...

Hi RiceHigh,

In your wealth of experience with Pentax focusing problems, have you been able to conclusively point the finger at a faulty body when FF/BF occurs? I understand that the lens itself doesn't have much to do with the problem, as focusing is "through the lens", and all mechanincs and smarts are in the camera body. Is this correct? (Aside from infinity focusing problems where the lens cannot mechanically achieve infinity due to the focus ring stopping too early)

PS: You have a great blog site with a wealth of information, thank you!


Kind Regards.

RiceHigh said...

I believe you're correct here. It's the body! (which is off-calibrated and/or the design is not accurate enough by itself)

P.S. Thanks for your favourable comment regarding my blog site. Anyway, I hope that some days (later) I shall write only "technical articles about Pentax gear" but not also (rather heavily) on the other theme!

Ilmars said...

Hi!
I reading about Pentax K10D FF problems and I like to know is it just problem for Pentax gear, or other manufacturers have similar problems with their DSLRs.

For now I own K100D and there is no focusing problems for me, and if actual auto focus quality is same for K10D, then its OK for me.

P.S. Thanks for information you are sharing. :)

RiceHigh said...

> Ilmars said...
> I reading about Pentax K10D FF problems and I like to know is it just problem for Pentax gear, or other manufacturers have similar problems with their DSLRs.

Yes and No. In fact, some particular DSLR models are more infamous for FF/BF problems than the others, maybe they are more popular and/or just that they are less accurate. To name a few of those more infamous ones, which have been reported more numerously, are: Canon 10D / 350D, Nikon D70, Pentax *ist D / DS / DL and K10D.

So, you can see the problem is with any brand. However, Pentax DSLRs seem to have more problems than the other brands, i.e., more Pentax models here.

Do note that my above impression maybe not totally accurate as I do read Pentax forums more frequently, nevertheless.

> For now I own K100D and there is no focusing problems for me, and if actual auto focus quality is same for K10D, then its OK for me.

My researches tell me that the K100D has (much) less reported AF problems except that it still does FF under tungsten lightings.

> P.S. Thanks for information you are sharing. :)

You're welcome and it's my pleasure to share the stuff I know. :-)

NogBoy13 said...

Does anyone have a focus problem using the older screwmount primes with the adapter?
Have the problem with both my SMC50mm 1.4's, the 50mm 1.8 and the 135mm 3.5(manual focus).
My K10D indicates razor sharp images in the viewfinder but the subsequent images are almost always soft... most of them in fact. Am getting the problem right thru the F stop range but is noticeably pronounced with the larger apertures. I didnt have this problem with the DS2... and I do know how to focus a lens! NogBoy13

Anonymous said...

Perfect Post!

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