Zykkor Macro Bellows for Minolta AF Sony Alpha SLR DSLR camera Macro bellows help toextenddistance between camera and lens. This way you can shorten the focus limit and increase the magnification. The fartherlensfrom the camera, the greater is the magnification of the subject. Light Tight, Black Bellows expands up to 150mm Includes Tripod mount socket, Ruled & Geared focusing rail, Smooth focusingwith Locking knob.