Allows you to reverse mount a NIKON lens. Use SRB~Griturn SPACER RINGS between the camera and the ring to increase magnification. Use SRB~Griturn STEPPING RINGS to use with a lens having another size filter thread. These adaptors allow ANY lens with the appropriate filter thread to be reverse mounted.
Note: some of the later film cameras, and most of the digital SLR cameras will not allow ANY metering when the lens is reversed.
