Orion 100 MM ID Ring Set
The Orion 100 mm ID Ring set features quick-release, hinged clamp knobs and felt lining. Designed for use with Orion telescope mounts and they fit other brands of mounts as well. One of the two rings in the set has a 1/4"-20 piggyback camera adapter on it, the other has a threaded 1/4"-20 hole. The piggyback camera adapter can be removed for mounting an adapter plate for a guide telescope on top of the tube rings. For use with SkyView Pro or Atlas telescope mounts, you will also need a dovetail mounting plate.