Celestron 93635-A T-Adapter for NexStar 4, C90 Mak and C130 MakThis sturdy aluminum t-adapter is the accessory of choice if you'd 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'll need the appropriate t-ring for your camera body (no.93402 For Nikon and no.93419 For canon EOS). Remove the lens from your camera and attach the t-ring in its place. Since the t-ring is camera-brand specific, it will snap right on just like a lens. Next, remove any accessories from the rear cell of your telescope. Screw the Celestron NexStar 4se t-adapter onto the rear cell threads until secure. Now, thread the t-ring and camera onto the t-adapter. That'S all there is to it. The camera is now using your telescope as a telephoto lens. Prime focus photography is popular for short exposure images of terrestrial objects as well as celestial objects like the moon.Celestron T-Ring for 35 mm Nikon CameraA T-Ring is one of the first accessories you will need if you want to take pictures through a telescope or spotting scope. If you have a Nikon SLR or DSLR camera body, the Celestron Nikon T-Ring is the one for you. In order to use the Nikon T-Ring, remove the lens from your camera, and attach the T-Ring in its place, just as you would if you were mounting a lens. The telescope side of the T-Ring has threads that will accept a variety of camera adapters, including the Celestron T-Adapter. The adapter you choose depends on the type of photography you wish to do. You can take pictures of terrestrial and/or celestial scenes by using a simple T-Adapter to turn your telescope or spotting scope into a large telephoto lens. The #93633-A T-Adapter is the best choice if you own a Schmidt-Cassegrain telescope with standard rear cell threads. If you have a refractor or spotting scope, the Universal T-Adapter (#93625), with its 1.25” barrel insert, is probably the best choice. There are also special T-Adapters for the EdgeHD optical system: one for the 8-inch EdgeHD (#93644) and one for the 9.25, 11, and 14-inch EdgeHD (#93646). Prime focus photography is popular for short exposure images of terrestrial objects as well as celestial objects like the Moon.