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. The piggyback camera adapter can be removed for mounting an adapter plate for a guide scope on top of the tube rings. For use with SkyView Pro or Atlas telescope mounts, you will also need a dovetail mounting plate.
Set of two rings includes mounting bolts and washers. Inside diameter (ID) is listed. Choose the size that matches the outside diameter of your telescope tube.
|Tube Ring Reference Table|
|Item #||Ring Inside Diameter (ID)||Rings Fit|
|7369||76mm/3.0"||Orion Observer 70 refractor telescope|
|7370||90mm/3.5"||Orion AstroView/Explorer 90 Refractor Telescopes, Orion ShortTube 80 Refractor Telescope, 80mm f/11 telescope optical tube assembly|
|7371||100mm/3.9"||Orion AstroView 100 Refractor Telescope, StarMax 90, Orion SkyView Pro 100mm Refractor Telescopes, Orion 80mm ED Refractor Telescopes, 100mm f/6 telescope optical tube assembly|
|7372||116mm/4.6"||Orion Apex 102 Maksutov-Cassegrain Telescope, Orion AstroView 120/120ST Refractor Telescopes, 120mm f/5.0 and f/8.3 telescope optical tube assemblies|
|7373||140mm/5.5"||Orion ShortTube 4.5 Reflector Telescope, Orion StarBlast 4.5 Astro Reflector Telescope|
|7374||144mm||Orion Apex/StarMax 127 Maksutov-Cassegrain telescopes, Orion SkyView Pro 127 Maksutov-Cassegrain Telescope|
|7375||182mm/7.2"||Orion SkyView Pro 6 and 6LT reflector telescopes, 150mm f/8.0 telescope optical tube assembly|
|7376||235mm/9.25"||Orion SkyView Pro 8 Reflector Telescope, Orion Atlas 8 Reflector Telescope, 203mm f/4.9 telescope optical tube assembly|
|7377||298mm/11.7"||Orion Atlas 10 Reflector Telescope, 254mm f/4.7 telescope optical tube assembly|
Notes for Selecting Tube Rings:
Outer diameter (OD) of the telescope should match inner diameter (ID) of rings. If OD of the telescope is a little smaller than ID of the rings, that is OK; you can "shim" inside of rings with extra felt.
The column labeled "Rings Fit" can be used as a guide for selecting appropriate rings if you don't know the OD of the telescope.