The Canon ERC-E4L Large EOS DSLR Rain Cover is a large cover that protects your EOS Digital SLR camera from rain. Simply place it over the camera and lens and you're good to go, even in inclement weather. This cover offers waterproof protection without impairing visibility at all, thanks to a transparent window to the LCD panels and monitor. With this cover, rain will never get in the way of your shooting again.
All EOS DSLR cameras with following lenses or those of equivalent size:
EF 400 mm f/2.8L
EF 500 mm f/4L
EF 600 mm f/4L
EF 800 mm f/5.6L