| I have done this on my K10D as well. I was initially disappointed with a new DA*50-135. Then I found this info and made my adjustment. I thought I threw off my Sigma 17-70 (which I have always considered very sharp), so I exchanged the new lens with Adorama. When the second copy was also disappointing, I got further into testing my 17-70. I found it was back focusing too (only really noticable at wide open aperture). I now have my body set at +150 and have checked both lenes on a focus chart at 45`and at real world distances. As best I can tell, I've now got my focus point at about 1/3 of the way through the sharp area. Perfect!
Thanks to all that pointed the way to, and to those that "developed" this access.
Brian |