This Sky-Watcher Extendable Camera Adapter is barreled for 1.25″ eyepiece ports, allowing you to attach a camera with a T-Ring to your telescope. Extension tubes are often necessary for astrophotography, when the existing connections to the eyepiece port doesn’t give enough length for the camera to attain proper focus; especially reflector telescopes. With this flexible extension adapter, you can adjust the adapter to find the ‘sweet spot’ for your camera to find focus for your subject. It can also be used for eyepiece projection (with a Plossl eyepiece secured inside of it to give you more magnification for your images).