The celestron t adapter for schmidt cassegrain telescopes is the accessory of choice if youd like to attach an slr or dslr camera to the rear cell threads of a schmidt cassegrain telescope for prime focus photography suitable for the nexstar 5se nexstar 6se and nexstar 7se to get started you will need the appropriate t ring for your camera body 93402 for nikon 93419 for canon eos first you remove the lens from your camera and attach the t ring in its place as the t ring is camera