Orion 7388 1/4-Inch Adapter for Telescope Mounts Mount adapter provides threaded post for attaching instruments equipped with a 1/4"-20 threaded socket Installs securely onto mount head of Orion AstroView, SkyView Pro, Sirius, and Atlas equatorial mounts; VersaGo II, VersaGo III, and AZ-4 altazimuth mounts, plus many other brands Vital accessory for obtaining star-trail photos with your EQ mount and a point-and-shoot, SLR or DSLR camera Useful for securely attaching spotting scopes to an EQ mount Adapter makes it easy to attach and detach instruments without using tools