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I had a Bintel 2" mirror diagonal on my old C925 and it was a perfectly good piece of kit. But whatever you do fit, make sure that it makes rotating the diagonal on the back of the scope easy. Initially I bought the "SCT thread" version of the diagonal I was using, which screwed straight on to the rear cell of the OTA, but rotating it was a royal pain. A 2" extension tube with the right SCT thread and a compression fitting at the other end and a 2" nosepiece on the scope side of the diagonal was much better.
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