Pentax K10D Focus Correction

[Gravyboy]

I've recently noticed that depending on which lens I'm using the number of shots that are acceptably in focus changes...

I took to using the DEBUG mode that can be set on the Pentax K10D and with a rudimentary focus chart saw that I had to set the following values for focus correction:

Pentax 40mm f2.8 ltd - @f2.8 = +120um
Pentax 18-55 f3.5-5.6 - @ 35mm & f4.0 = +60um
Sigma 55-200 f4-5.6 - @ 100mm = -60um

Is this unusual and is there anything I can do about it? Or am I best resetting the correction when I change lens - which tbh isn't that much of a ball-ache.

Thoughts please...

 

[Mike.P]

I have had 2 K10Ds now (inc yours) and both required some focus correction with certain lenses (DA* 55mm 1.4 and Sigma 70-200mm f2.8 come to mind). I just changed the amount of correction according to lens. I kept a small printed laminated card with the values on in my bag)

The same ones also need correction on the K-5 but at least I have settings in camera and don't have to keep changing every time I use a different lens

 

[Gravyboy]

TBH with the Debug being so easy, and the fact that 10secs to adjust the correction is nothing compared to the time it takes to change lens then I'm pretty much swinging the same way...laminator here we come.