Construction CNC professional manufacturing and exquisite workmanship. This Camera Extension Tube Macro Ring is made of aluminum alloy, durable, does not deform, and is corrosion resistant with a glossy exterior. Finish includes a professionalgrade matte paint on the inner wall. External coating is a black hardoxidation finish. Unique Design and Versatility The 3 extension tubes can be added between the camera and the lens. This Macro Extension Tube for Sony Alpha Minolta MA mount cameras is composed of 3 extension tubes – 7mm, 14mm, 28mm adapters and a male & female adapter (about 11mm height). There are totally 8 combinations. Mount the tubes between the lens and camera body to select your macro range. Macro Magnification and Control Extension tubes are metal tubes with a rearlens mount at one end and a camerabody mount at the other end. They can be used in any combination or individually to obtain the exact magnification you need to capture the macro shot. The longer the tube length, the closer the lens can focus. Compatibility and Use Compatible model: Fits All Sony A DSLR and Minalta MA Lens; Sony Alpha Minolta MA mount Lens and Digital Camera Sony A58, A65, A57, A77, A900, A55, A35, A700, A580, A560, A550, A500, A450, A390, A350, A330, A300, A290, A230, A200, A100, A33 (DO NOT work for A99/A99II).