Canon RF-S3.9 mm F3.5 STM DUAL FISHEYE Instructions Manual page 10

3. Focusing/Control ring
The focusing/control ring can be used as either a
focusing ring or a control ring.
Focusing/Control ring
Switching between the focusing ring and control
ring is performed on the camera.
Please refer to the camera's instructions for
details.
Use as a Focusing Ring
Set the focus mode (AF/MF) on the camera.
To shoot in autofocus (AF) mode, set the
camera's focus mode to [AF].
To use only manual focusing (MF), set the
camera's focus mode to [MF], and focus by
turning the focusing ring (focusing/control ring).
Use as a Control Ring
Set the control ring function using the camera's
menu. The control ring can be assigned the
functions that are commonly used with cameras,
such as shutter speed and aperture settings.
Please refer to the camera's instructions for
details on how to use the control ring.
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