Gosky Superior Quality 5-position 2inch Filter Wheel/Revolver for Astronomical Telescope Just rotate the wheel and the selected filter rotate into place quickly and easily. Change filters without removing your telescope eyepiece . Up to 5-position, Standand 2" Threads crafted well for a variety of different brand filters. Easy to use -just attached to your focuser either by the supplied 2" nosepiece adaptor or via a M48 thread. You can attach a T-ring with M48 thread on it. Protects filters from dust, dirt, and impact, and keeps them ready for action. Fully sturdy aluminum constructed- suitable for heavy cameras.