Nikon Mount, for all Nikon SLR & DSLR It moves the lens farther from the film or digital sensor. The farther away the lens is, the closer the focus, the greater the magnification. This extension tube does not affect image quality as there is no optics inside. In comparison, a close up filters are often blamed for degrading image quality. Brand new, never used; Made of metal (not plastic); color : black Adjustable Length This extension tube consists of 5 parts: Camera Body Mount Adapter Lens Mount Adapter 9mm tube (Tube 1) 16mm tube (Tube 2) 30mm tube (Tube 3) The more tubes you add, the closer the focus and the greater the magnification. Remarks There are no electrical contacts in the extension tubes. Exposure has to be adjusted manually. Aperture control is not available if you use a lens which does not allow you to manually adjust the aperture (without an aperture ring). Suitable For ALL NIKON DSLR and Film SLR and Lens