The 95mm Lens Hood for 50mm f/2.8 PC TS Lens from Schneider is a round, aluminum lens hood specifically designed for the Schneider 50mm f/2.8 PC Tilt/Shift lens. It fits all the various mounts (Nikon, Canon, and Sony) of this lens. Lens hoods are primarily used to prevent unwanted light from entering the lens and creating flare on the image. They also provide a degree of protection for the lens from accidental impact, rain and dust. This is a dedicated lens hood made for the particular focal length and characteristics of its lens.