The Horseman SW617 Standard Medium Format Panoramic Camera with Rodenstock 90mm Lens Unit features an ultra wide 6 x 17 cm image with the high image quality of large-sized photograph. The optional ground glass back also allows critical focusing and compositioning. The 6x17cm (120 roll film/4 exposures) can be attached to the back of the camera unit. The locking buttons on either top and bottom of the camera body enable you to attach and detach them. Providing an extra roll film holder in advance will allow you to take your next photograph immediately, without having to load another film.