K20D AF Accuracy Improvement Over K10D/K100D

Started Mar 5, 2008 | Discussions thread
frank
OP frank Veteran Member • Posts: 6,961
K10D+DA21 vs K20D+DA21 (15x imgs)

As reported by some users, some DA21 lenses have BF problem on a K10D camera:
http://forums.dpreview.com/forums/read.asp?forum=1036&message=24445741
http://forums.dpreview.com/forums/read.asp?forum=1036&message=27049158

I think some would be interested in a comparison test between the K10D and K20D using the same DA21 lens.

Managed to do a comparison test last night, and another one this morning. I found the DA21 will refocus on both K20D and k10D camera as reported by blende8:
http://forums.dpreview.com/forums/read.asp?forum=1036&message=24445741

But the results certainly are not the same. Here are the comparisons when the aperture is set from F3.2 to F8 on both cameras. We can see that at F6.3 (after refocusing) the result from K10D is far better than wider apertures, but still not as good as those from K20D:

This morning I did another test: set the aperture value from F8 down to F3.2 on both camera. And you can see the results from K10D are better than if set the aperture value the other way around, but still not as good as those from K20D:

Here is the comparison between the two tests w/ the K10D+DA21 combo (sorry about the WB difference. I did the tests at two different time):

A tripod was used to take all the photos. All photos are 100% center crops.

I wasn't too happy with the DA21 lens on either K10D or K100D, but I'm very please w/ it on K20D

-- hide signature --

Frank
GMT+8hours

 frank's gear list:frank's gear list
Fujifilm XF1 Pentax K-3 Pentax smc FA 31mm F1.8 AL Limited Pentax smc FA 43mm F1.9 Limited Pentax smc FA 77mm 1.8 Limited +1 more
Post (hide subjects) Posted by
Keyboard shortcuts:
FForum PPrevious NNext WNext unread UUpvote SSubscribe RReply QQuote BBookmark MMy threads
Color scheme? Blue / Yellow