Canon EOS 5D Mark III Instruction Manual (en)

Q Quick Control During Playback
To rotate an image, set [51: Auto rotate] to [Onz
D]. If [51: Auto rotate
is set to [On
D] or [Off], the [b Rotate image] setting will be recorded to 
the image, but the camera will not rotate the image for display.
Pressing the <Q> button during the index display will switch to the 
single-image display and the Quick Control screen will appear. Pressing 
the <Q> button again will return to the index display.
For images taken with another camera, selectable functions may be