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You need a low-profile T-ring to SCT mount (ScopeStuff, TALP is the product code I think). The low profile ring screws onto the thread at the cassegrain focus of the SCT, and couples the Tring on the camera to the SCT. It is thin enough to let the camera get all the way to the zenith without banging on the mount (ugh). My Pentax K200D will just fit when using a Focal Reducer (f/3.3) on my LX90 8".
If using Barlow / Teleview then you would put them in the light path after the diagonal. Be aware that the system will have flexure because of the length of the tube and lack of support; and keeping track of your object may be a challenge :-)
Regards,
Tony Barry
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