Attaches to Bellows Lens Hood G-3. Using the Front Hood for G-3 along with Bellows Lens Hood G-3 will bring higher vignetting efficiency. With the Front Lens Hood used on the Bellows Lens Hood G-3, it is possible to use 127mm lens or longer focal length lenses, except for 100-200mm zoom lens and 500mm lenses. Front Hood for G-3 has an inserting slot for 4" x 4" square size vignetters such as Sailwind and Leon. Maximum and minimum extension of bellows: 105mm and 25mm.