The 2" Rear Port Adapter threads onto the rear port of Meade and Celestron SCT telescopes and allows you to view or image straight through the scope using any 2" accessory
This 1.25" Adapter threads onto the photo port of the ETX-90/105/125, Celestron NexStar 4 and C90 as well as other scopes having a 34.6mm rear port thread and allows you to view or image straight through the scope using 1.25" accessories. NOT FOR ETX 60/70/80, WILL NOT REACH FOCUS.
This adapter threads onto the photo port of the ETX-60/70/80 (or other scopes having a 34.6mm rear port thread) and converts it to a standard 42mm T-Thread. The only way to connect a camera to these scopes and reach focus is to use one of these along with the proper 42mm T-Ring to fit your camera.