« on: March 17, 2013, 08:51:22 PM »
After I made my post I started thinking about my set-up: It was hand held and the focal plane may not have been parallel to the screen door. So I did a proper set-up on the tripod and did some shots at wide open and with the zoom set at both ends and the middle. I got better results with the set up so that the focal plane was parallel to the wall. I see a bit of softening at 105mm in the corners with the aperture wide open and down to f/7; aperture doesn't seem to matter, but by 70mm the image is tack sharp corner to corner. 24mm is very sharp. I taped a cloth towel to the wall. The fine fibers make for a good image to resolve. I also found that when focusing manually, I did not get the image as sharp as the autofocus. I appreciate what I am learning on this website. I feel better about my new camera and lens after making this test.