I received this as part of a camera package and have no use for it. I've been told that it is threaded for Meade SCT's, however it does attach to my C8. The mirror is becoming discolored in one corner, and there is no way to adjust prism orientation. I have no use for it, so rather than having it gather dust, I'd prefer to put it in a good home for $18 shipped CONUS. I can have pictures available tomorrow if necessary.