The celestron t adapter for nexstar 4se telescopes is a sturdy aluminum t adapter for when youd like to attach an slr or dslr camera to the smaller rear cell threads of a celestron nexstar 4se telescope or c90 spotting scope for prime focus photography 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 brand specific it will