Many photographers use lens hoods when taking photographs. The lens hood helps block out the sun, which can cause an unwanted flare in what would have been a perfect shot. Canon makes lens hoods for almost all of its lenses, depending on the type and size of lens. The hoods are very easy to connect to the lens. Nikon 18-135mm 18-70mm D50 D80 D70s Canon Lens Hood HB-32, prevent glare and lens flare caused by unwanted light, Protect your lens from minor impact.