These are test images comparing this lens with my Pentax SMC-FA 100mm f2.8 Macro and SMC-FA 135mm f2.8 lenses. They are 300x300 pixel 100% crops from photos taken with my *ist-D. The USAF chart was about 2m from the camera; this distance was adjusted to provide about equal magnification. The brick wall was about 40m away; no adjustment was made for magnification.