Extension tubes are designed to enable a lens to focus closer than its normal set minimum focusing distance. This Macro Extension Tube is used by attaching between camera body and Nikon AI lenses, it comes with a set of 3 tubes of different lengths. This extension tube does not affect image quality as there is no optics inside. In comparison, close-up filters are often blamed for degrading image quality. Note: The camera is not included 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 3 tubes of differnet lenghts can be used individually or in any combination to obtain the desired magnification.