Just a quick check before my lens goes to the doctor
My recently purchased (used) 300f4 L is noticeably soft. I have microfocus-adjusted and get good sharp results when I do it, (I check on a computer screen, not the lcd).
Here's the workflow:
Mirror lockup, timer, tripod, set the focus through the in-camera menu, adjust the focus with AF on.
Push the 'set' button to register the lens after I finish, and take a test shot.
I've also done it tethered with Canon Utilities, same result, great test shot, adjustment doesn't register.
I don't press the shutter in between, so it's not reverting back to the soft AF point.
The camera doesn't seem to register the MFA changes, even though the MFA scale shows the adjustment. When I took test shots by manually focusing, the image was very sharp, so I know the lens can be adjusted.
Am I missing a step here? I'm going bald with all the hair-pulling, and it's not a good look on me,lol.
Any ideas appreciated.