Originally posted by Stratario The debug mode fixes the focus for one lens only. If you change lenses, it's going to affect the next lens as well, unless you change it back to zero. Pentx service shops however have the ability to made adjustments for up to four lenses.
However, according to Pentax, they will only do calibrations for Pentax-made lenses. So, for my main walk-around lens (a Tamron 18-200mm), they won't touch it. So even if they CAN calibrate it for multiple lenses, it doesn't help me. I have two Pentax lenses...a nice HSM DA* 50-135mm and an M50. I also have a Super Takumar 300mm f/4. But my other lenses are the Tamron and a Sigma 10-20mm.
I thought that the self-calibration in debug mode had fixed most of my issues, but I took the Tamron out to the parent's farm and went shooting at the scenery. Some were nice, but many were blurry that really had no reason to be. Hmmm.....I'm going to have to just sit down and do some serious focus tests with each lens that I have to see if it's me now, or if it's the AF.
Pentax did say that they would calibrate my K10D with the DA* 50-135 for free since I bought the lens less than a year ago. I have three months to ship it to them before that offer is off the table. I'm thinking about it....