Orion's cast-aluminum tube ring set features quick-release, hinged clamp
knobs and felt lining. Designed for use with Orion telescope mounts,
they fit some 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.
Filed under: Eyepieces & Accessories