This sturdy, high-quality adapter provides a solid connection between your Schmidt-Cassegrain or Maksutov-Cassegrain telescope and 2” accessories without any special threaded 2" diagonal. This accessory makes it possible to maximize your views through your telescope with your standard 2” diagonal, eyepieces, and other accessories (like photo adapters) allowing you to connect a camera for astroimaging. The adapter offers an ultra-secure threaded connection to your telescope. On the other side, a brass compression ring provides a strong grip on eyepieces accessories without scratching or denting their barrels. To tighten the ring around the accessory, just adjust the set screw. With its precision machined aluminum construction and black anodized finish, this adapter will resist corrosion and wear, providing you with years of use. The black interior also reduces the internal light reflections, enhancing your view.