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The visual back comes standard with most Schmidt-Cassegrain telescopes of 5.0" to 8.0" diameters. It screws on to the rear threading to reduce the cavity to take accessories of 1.25", such as star diagonals and tele extenders.
In the Box
Celestron Visual Back (1.25") - Screws Onto the Rear of Most Schmidt-Cassegrain Telescopes and Allows Use of 1.25" Diagonals, Tele-Extenders & Other Accessories