Canon EF 300mm f/4L IS USM EF300mm F4L IS USM Instruction Manual - Page 11

Filters - with extender

Page 11 highlights

8. Hood 9. Filters (Sold separately) You can attach filters to the filter mounting thread on the front of the lens. • If you need a polarizing filter, use the Canon Circular Polarizing Filter (77mm). • To adjust the polarizing filter, first store the lens hood. The built-in lens hood can reduce unwanted reflections and also protects the front of the lens from rain, snow, dust, and other substances. When using the hood, extend it outward from the end of the lens until it stops and then turn it in the direction of the arrow. For storage, reverse the procedure. ENG-10

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ENG-10
You can attach filters to the filter mounting thread
on the front of the lens.
9. Filters
(Sold separately)
If you need a polarizing filter, use the Canon
Circular Polarizing Filter (77mm).
To adjust the polarizing filter, first store the lens
hood.
8. Hood
The built-in lens hood can reduce unwanted
reflections and also protects the front of the lens
from rain, snow, dust, and other substances.
When using the hood, extend it outward from the
end of the lens until it stops and then turn it in
the direction of the arrow. For storage, reverse
the procedure.