Orion 52024 2-Inch to 1.25-Inch Precision Centering Adapter (Black) Handy adapter precisely centers any 1.25 inch eyepiece, collimating tool, astrophotography camera nosepiece, or other 1.25 inch accessory in a 2 inch focuser Scratch-free compression mechanism accurately centers any inserted 1.25 inch telescope accessory Better than thumbscrew-equipped holders, which can push inserted items off to one side of the telescope's light path Made of machined, anodized aluminum Barrel is threaded for use with 2 inch Orion eyepiece and astrophotography filters