Shutter speed verses sharpness: Canon 6d @300mm no IS.

I recently sent my camera back to Canon for recalibration after I noticed all of my telephoto shots seems to be fuzzy after cropping. The results came back and they basically found nothing wrong with the camera or lens..
My question is based on the results below is there a shutter speed for taking telephoto shots where the sharpness falls off due to internal vibration of some sort?
I am also at a loss as to why mirror lockup ,(with MF) would not be the same as a shot using live view with AF.
Is there shutter movement that occurs during mirror lockup using eyeview that does not occur using LiveView AF?
(I have not performed this test at higher shutter speeds due to internal lighting issues)
I performed these tests using the following fixed points:
RAW mode
focal length 300
Fstop 5.6
ISO 200
Shutter speed 1/60
No IS enabled
Camera mounted.
All shots were taken with 10 second shutter delay
Calibration target area is dead center of focus area.
Here are the tests I performed:
1.LiveView AF mode: sharp as a tack consistently
2.LiveView Quickmode: slightly less sharp but still extremely good
3.EyeView Miror Lockup,(switched to MF after allowing LiveView AF mode to find focus)
4.EyeView No MirrorLock,(switched to MF after allowing LiveView AF mode to find focus)
1.LiveView AF mode
2.LiveView Quickmode
3. Eyeview Mirror lockup
4.Eyeview NO Mirror lock
Solved!
Go to Solution.

1/60 second is usually too slow with a 300mm lens. Even with IS, which the Exif data say you're not using, it would be problematical.
Bob
Boston, Massachusetts USA

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