Camera Rain Cover.Fits SLR's with up to 100-400mm zooms. This cover will meet the needs of most photographers. It's designed for use with SLR cameras (film or digital) with all the lenses you're likely to own, including: *Canon 70-200/2.8 & 100-400mm IS lenses. *Nikon 70-200/2.8 & 80-400mm VR lenses. Can be used with shorter lenses as well, you just have some extra fabric that "bunches up" easily. Key features: For handheld or tripod shooting. Dials & buttons are visible when cover is held against the camera. Fits with a external flash on the camera. TTL flash works with the cover on. Works with lenses that rotate to focus. Compact & ultralight. 15" cover weighs ~1 oz. Made with silnylon -- a waterproof and very durable fabric. The cover has an elastic cord & lock on both ends. You attach the cover around the lens, and leave the back end open however much you want when you're shooting, and close it down when you're not shooting. NOTE--the cover looks opaque if it's not touching the camera, but is remarkably transparent when it's touching something -- see photos.