Celestron Sony E-Mount T-RingA T Ring is one of the first accessories you will need to take pictures through a telescope or spotting scope. If you have a Sony E mount mirrorless camera body, the Celestron E Mount T Ring is the one for you. How to Use To use this T Ring, place the E Mount T Ring on your Sony mirrorless camera. Just like changing a lens, line up the T Ring to your cameras lens mount. Push it in and turn until you hear a click. The T Ring has a sturdy bayonet flange