Derby-
Thanks for posting your photos taken with the K15/3.5. They
certainly look sharper than my results with the A15/3.5. These
lenses are supposed to have the same design, but my A15 shows very
poor sharpness at the edges and in the corners unless stopped down to
f11. Results with my *ist-D are poorer than with film; perhaps this
lens just doesn't work well with digital sensors. I'm surprised that
Rob has reported good results with it on digital.
It's possible I have a bad copy, but it has been serviced by Pentax.
Regards, Jim
