Canon RF-S3.9 mm F3.5 STM DUAL FISHEYE Instructions Manual page 12

4. Checking/adjusting left and right focus
Checking Left and Right Focus
When first mounting this lens on the camera, or when using it after being transported for an
extended period, use the following steps to check the difference between left and right focus.
1
Display an enlarged image from the
left lens, then either use the camera's
autofocus (AF) or turn the focusing ring
(focusing/control ring) to focus the lens.
For information on how to display an enlarged image from the left lens and how to switch display of
z
enlarged images between the left and right lenses, refer to the "Shooting and Recording/Focusing" section
in the VR Recording Guide.
2
Switch to an enlarged image from the
right lens.
If the focus in the enlarged image from the right lens
z
is correct after switching, adjustment is not needed.
Only adjust the focus, using the steps on the
following page, if the focus is not correct.
ENG-11