Shorten the focus limit and increase the magnification of any lens; expandable with Fotodiox Adapters The farther the lens is from the camera, the greater the magnification ratio up to 8:1 (3:1 with 50mm Lens) Light tight accordion bellows expands up to 110mm for lens focusing, from 3,5cm to 14,5cm Include tripod mount socket, ruled & geared focusing rail, smooth focusing with locking knob Limited 2-Year Manufacturer Warranty