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I am using a QHY medium OAG on a Celestron C925 with a ZWO 290MM mini guide camera. I went to the QHY from an Orion Thin OAG as I found the Orion not to be rigid enough for the job. The QHY is only about 13mm thick so it works on the SCT with the 0.63 reducer backfocus requirements, and the threaded adapter plates both sides are fixed with screws front to back so it is nice and rigid, on my ASI2600 I would be able to use the screws to fit it directly to the tilt plate on the front of the camera if I wanted to use it on that cam.
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