Canon RF800mm F11 IS STM RF600mm F11 IS STM RF800mm F11 IS STM Instructions - Page 10
Setting the Focus Mode
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3. Setting the Focus Mode Focus mode switch Focusing ring 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. zzBe sure to update the camera's firmware so it is compatible with this lens. zzThe range-finding area with the camera* after updating the firmware is an area of the image plane of approx. 40% horizontal x approx. 60% vertical. This remains constant even if an extender is attached. zzQuickly turning the focusing ring may result in delayed focus. * As of March 2020: EOS R, EOS Ra, EOS RP zzThe lens' focusing ring is electronic. zzWhen 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) However, the camera settings need to be changed. Please refer to the camera's instructions for details. ENG-9