SUPERNIC ET-65B Camera Lens Hood USM to be Used with Canon ET-65B EF 70-300mm f/4-5.6 Lens Hood  (67 mm, Black)

ET-65B is a bayonet lens hood designed for use with this lens Canon EF 70-300mm f/4-5.6 IS USM and will no longer work with any other hood. For details please name and 100% match your lens description before purchasing this LH-65B lens hood. A lens hood is designed so that it does not block the angle of view of the lens. Lens hoods block out the sun or other light source to prevent glare and lens flare. The lens hood can also be used to protect the lens and the lens from the elements without having to replace the lens cover. The geometry of the lens hood depends on three parameters: the focal length of the lens, the size of the front lens element, and the dimensions of the image sensor or film in the camera. Flare occurs when the stray light strikes the front element of the lens and then bounces inside the lens. This stray light often comes from a very bright light source, such as the sun, Bright studio light, or bright white background. In addition, lens hoods can provide physical protection for the lens due to the hood being further forward than the lens, which protects the front barrel from potential impacts against walls, door frames and other real-life obstacles.