Tenba RC-26 Rain Cover for Camera (631-225) Rain Cover for SLR camera with 600mm f/4.0 or similar sized lens and hood. The 600/f4 is sure bigger, but if you need that kind of glass and it's raining you have only one choice (besides using your dry cleaning bag and duct tape): The RC-26, a waterproof lens and body wrap that lets you work in wet and rainy conditions. The 600/f4 is sure bigger, but if you need that kind of glass and it's raining you have only one choice (besides using your dry cleaning bag and duct tape): The RC-26, a waterproof lens and body wrap that lets you work in wet and rainy conditions.