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Hi All -
I was on a shoot recently and was unhappy with the sharpness of my 5DIII/100-400 combination so I began to investigate.
Here is what I've found and my question
I can focus better in live view than AF (no surprise). Pretty pronounced difference and no amount of MA makes them equivalent though I can go from unsharp to sharper to unsharp as I move through the MA range. Sweet spot is around +5. My 100-400 is sharp on another 5DIII and their 100-400 is not sharp on my body (but sharp on theirs). Switch kit and it follows the kit and not the photog (not technique). Seems like some sort of AF issue.
Here is what I don't get. If I AF focus, and shoot with mirror lockup and then switch to live view and release the shutter without refocusing the live view images are sharper. Shooting off a stable tripod, using a remote, IS off, several seconds delay between lockup and releasing.
This is absolutely consistent. Does it make any sort of sense?