07-25-2011, 08:25 AM
thank you very much for the tip, I will perform this test as soon as I get back from holiday. When using a Pentax K5 with tripod and AF focusing; the result will be unsymetrical and somewaht blurres images on edges(not the eges of the frame) of the target object. Probably a good idea to test the 18-135 zoom at 31mm focal length too?