Canon EF 600mm f/4L IS III USM EF600mm f/4L IS III USM Instruction Manual - Page 9
Setting the Focus Mode
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3. Setting the Focus Mode Focusing ring OO Quickly turning the focusing ring may result in delayed focus. Focus mode switch To shoot in autofocus (AF) mode, set the focus mode switch to AF. To use only manual focusing (MF), set the focus mode switch to MF, and focus by turning the focusing ring. See p. 14 for information on power focus (PF). OO The lens' focusing ring is electronic. OO When AF operation is set to [ONE SHOT], manual focus is possible after autofocusing has been completed by continuing to press the shutter button halfway (Full-time manual focus). There are times when camera setting changes are required. OO When the AF button assignment is changed from the "shutter button" (using the camera's Custom Function), manual focus is always possible regardless if the shutter button is pressed halfway any time the lens is not autofocusing. ENG-8