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The Nightscape astro-imager has standard female T-threads on its nosepiece. So the easiest way to attach it to your scope is with an appropriate T-adapter. The following table lists the T-adapters used with different Celestron scopes

If you want instead to use the camera in an eyepiece drawtube or visual back, then you need either the #93625 1.25” Universal T-adapter for a 1-1/14” eyepiece drawtube or the Barlowed version #93640 if you want to use negative projection and or have limited back focus (for example, your scope is a Newtonian reflector).

The Nightscape's nosepiece is a 2" diameter barrel, so it will fit directly into a 2" focuser.