TheCanon EOS Rain Cover Large ERC-E4Lis a conveniently light weight weather protection system that is designed to defend your long lenses and camera from the elements while shooting. So that it is with you when you need it most the rain cover has a collapsible lightweight design todiscreetly fit in a bag without occupying criticalspace. Theclear window on the rear of the cover allows full visibility and functionality to the camera while keeping moisture out.

Compatibility
EF 400 mm f/2.8L
EF 500 mm f/4L
EF 600 mm f/4L
EF 800 mm f/5.6L