Specifically designed for use with the Sony FE 400-800mm f/6.3-8 G OSS lens, this Sony Lens Hood attaches to the super-telephoto zoom lens via its dedicated bayonet mount. The rounded hood blocks unwanted stray light from entering the lens, preventing lens flares and maintaining image contrast. It also protects the front of the lens from accidental impacts such as drops or minor collisions with walls and other objects.