Canon EF100-400mm f/4.5-5.6L IS II USM Lens Instructions For Use Manual page 14

Hood
● Circular Polarizing Filter Adjustment Window
The hood features a circular polarizing filter adjustment window which, when opened, allows the user
to adjust the circular polarizing filter* while the hood is attached to the lens.
* Please attach the circular polarizing filter to the filter mounting thread on the front of the lens when the hood is
detached.
Circular polarizing filter adjustment window
Open the circular polarizing filter adjustment
window which is installed in the hood by
sliding it forward.
For information on attaching a circular polarizing
filter, please refer to the section entitled "12. Filters"
(p. 18).
Circular polarizing filter
Adjust the circular polarizing filter via the
open adjustment window.
Please close the circular polarizing filter
● ●
adjustment window during shooting.
ENG-13