Orion 05205 T-ring for Nikon Cameras (Black) Useful accessory allows you to attach a Nikon 35mm DSLR or SLR camera to a telescope, camera adapter, SteadyStar Adaptive Optics Guider, Off-axis guider, and other astrophotography accessories Attaches to camera body and provides a T-thread interface Couples camera body to standard T-thread found on many astrophotography camera adapters Fits Nikon 35mm DSLR and SLR cameras via bayonet-style attachment Made of anodized aluminum