If you’re shooting outdoors, especially when it is raining, then you will definitely need the Canon ERC-E4M Rain Cover. This Canon EOS Rain Cover keeps your professional camera clean and dry and protects it from the wet environment.
• The Canon EOS Camera Rain Cover is a medium-sized cover for your Canon EOS digital cameras

• Its transparent window that enables clear vision of the top and rear LCD panels and LC monitor
• Features attachable L and S eyecups, thereby making this Canon ERC-E4M Rain Cover compatible with Canon EOS digital cameras
• The front fastener allows you to easily attach and remove the lenses
• This Canon EOS Rain Cover is compatible with the EF 200mm f/2L IS USM, the EF 300mm f/2.8L IS USM, and the EF 400mm f/4 DO IS USM lenses

Keeps your professional camera clean and dry when shooting in a wet environment. Compatible with Canon EOS Cameras. Contains attachable eyecups (L,S) for compatibility with all EOS Digital cameras. Transparent window enables clear visibility of the top and rear LCD panels and LC monitor. Front fastener enables easy attachment and removal of all lenses. Displays a large printed "Canon" logo and includes a soft case for compact packing..

Compatibility

-- EF 200mm f/2L IS USM
-- EF 300mm f/2.8L IS II USM
-- EF 300mm f/2.8L IS USM
-- EF 400mm f/4 DO IS USM