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If you are upgrading from a stock prism diagonal and only use 1.25” eyepieces then check out Celestron’s 1.25" Star Diagonal. This accessory does not use set screws to tighten down your eyepieces, but instead, they have incorporated a clever twist-lock ring that evenly tightens around the barrel of your eyepiece like the blades of a camera lens, solidly holding it in place, leaving no scratches, nicks, or marks!
If these features sound intriguing to you, but you are looking for a diagonal that also handles 2” eyepieces then look no further than Celestron 2" Dielectric Star Diagonal with Twist-Lock. This innovative product comes ready to thread in the rear cell threads of an SCT, however, the threaded portion can be easily removed and replaced with a 2” nosepiece. Talk about ingenuity! If you have any questions as to which diagonal will best fit your viewing needs, our non-commissioned product advisors are happy to help.