Canon RF 35mm F1.4 L VCM Instructions Manual page 10

4. Manual/ Auto Aperture Operation
The aperture value can be set using the iris ring. At the time of shipment, it is set to auto aperture
operation.
Iris ring lock release switch
Manual aperture operation
While sliding the iris ring lock release switch
in the direction of the arrow, turn the iris ring
to match the iris index between 1.4 and 16.
Turn the iris ring to set the aperture.
Auto aperture operation
While sliding the iris ring lock release switch
in the direction of the arrow, turn the iris ring
to match the iris index with A.
Aperture is determined by the command
signal from the camera.
Iris ring
ENG-9