Originally posted by Canada_Rockies I suspect the 45° mention was to show front/back focus errors by focusing on one line of type and seeing where the focus actually is.
Can issues like this happen with auto focus and not manual focus? My shots in manual spot are exactly where I thought I focused, but the ones I did with auto (I did spot, then auto then sel setting) were either focusing above or under. I am going to try this test again, along with 90 degree angle test, because this seems odd to me.
So I have done a bunch of tests with the camera on a tripod, and using manual and af, and it always looks like the manual is sharper. I went through af.s with spot, auto, sel and manual. When I ignored what the camera said was in focus for manual, I got the sharpest image.