Orion 52072 2-Inch to 1.25-Inch Precision Centering Adapter Handy adapter precisely centers any 1.25" collimating device, imaging camera nosepiece, or eyepiece in a 2" focuser Scratch-free helical compression mechanism centers the 1.25" telescope accessory as it is tightened in place Centers telescope eyepieces and accessories better than thumbscrew-equipped holders, which can push inserted items off to one side of the light path Made of machined, black-anodized aluminum with an easily adjustable knurled twist-lock ring Barrel is threaded for use with 2" Orion eyepiece filters