EDIT - this information only works for K10D firmware 1.1 - the instructions do NOT work for later firmware versions that is probably the reason the original web page/blog is no longer available.
I am a little hesitant posting this -
there
used to be an article (blog) on the web that was titled -
Pentax DSLR focus correction
the url was -
(
http://)roman.blakout.net/?year=2007&blog=20070219132433
(DON'T click on this link as it is not valid -
I put the http:// in parentheis to reveal the actual url text -
otherwise the posting editor substitutes this link -
Roman Melihhov 2007; photos (all categories) )
(obviously the article is no longer there -
I do not know the reason for why it is no longer available -
I saved a copy of this page when it was still on-line, around the end of March/2007)
However I will quote (copy/paste) some relevant sections -
(
Disclaimer - I am only copy/pasting the information "as-is" -
and cannot vouch for any accuracy/inaccuracies,
any use is entirely at your own risk)
QUOTE:
Pentax DSLR focus correction
If your Pentax *istDL
v1.03, *istDL2, *istDS
v2.02, *istDS2
v1.02, K100D
v1.02, K110D
v1.02 or K10D
v1.10 is not focusing right, there's remedy for your camera that comes with newest firmware update. Get your latest firmware update first from the
http://www.pentaximaging.com/customer_care/software_firmware?sfFlag=f and then follow the steps below. Prior to changing mode to debug, I switched to central AF point. It's easier to see what you're focusing on. Grid value on the following examples - 0.1 inches (2.54mm). Photographed at 45˚ angle, a step of the ruler = 5um AF correction.
END QUOTE
QUOTE:
K10D series DEBUG STEPS
1. Your K10D' firmware version must be 1.10.
2. Test shot for focus trouble.
3. Turn the camera OFF.
While pressing [PLAY]+[OK], Turn the camera ON.
You can see firmware version on LCD screen.
4. Firmware version is appeared,
then press [Fn]->[Fn]->[INFO]->[MENU] within 5 seconds.
You get service menu!!!
5. by pressing [right key],change
DEBUG MODE [DIS] to
DEBUG MODE [EN].
then press [OK].
(save and LCD will be black out)
6. Press [MENU] and go to SETUP tab.
then, Press [^Up key], you can see TEST MODE.
7. Select AF TEST menu. now you have AF correction menu.
If you have Front-focusing, reduce the value.
If you have back-focusing, increase the value.
after adjust some value, press [OK] and quit out of setup menu.
8. TEST for focus, find out that focus is correct.
(repeat this from 6 for correct focus.)
9. Go to service menu(step 3,4).
change
DEBUG MODE [EN] to
DEBUG MODE [DIS].
then press [OK]. (save and LCD black out)
I used ruler photographed from macro distance at 45˚ angle. Autofocused precisely on a 4.5 line (maybe a little above. Picture below comes with corrected AF point, picture above appear backfocused. If your camera is front-focusing, reduce the value, if it's backfocusing - increase the focus correction value.
END QUOTE
Disclaimer - I cannot vouch for the accuracy or inaccuracy of this -
any use is entirely at your own risk.