Canon EF 8-15mm f4L Fisheye USM - Manual (Page 13)

ENG-12
7. Lens Cap
While the lens hood (included) is attached to the
lens, Lens Cap 8-15 can be attached to the lens
hood by pressing the buttons located on the
upper and lower sides of the lens cap and
aligning its recessed parts with the convex parts
found in the lens hood.
There is a gelatin filter holder at the rear of the
lens. Cut the gelatin filter to fit within the white
frames. Then insert the gelatin filter into the filter
holder.
8. Filter
(Sold separately)
Recessed Section
COP
Y