Compatibility: Work with Nikon AF AF-S DX FX SLR Cameras, including D5300, D5000, D3000, D3200, D5100, D5200, D3100, D7000, D7100, D4, D800, D800E, D600, D610, D40, D40x, D50, D60, D70, D80, D90, D100, D200, D300, D3, D3S, D700 | Function: Transform common lens into macro lens to capture the high quality images of small objects, enter the macro world. | Auto Focus?when installed the tubes, it needs appropriate ocusing distance(1-3cm) space to auto-focus function. | Tube diameter : ab.69mm. Tube Lengths: (1) 12mm.(2) 20mm.(3)36mm, use alone or combinations. | Note: when use 3 tubes together, there is a little difficult to auto focus. Suggest use manual focus or Increase the lens focal lengths to avoid blurry.