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Hi Chris,
I have had an excellent experience with the Sphinx. It's certainly a lot lighter and smaller that the EQ6 Pro, although naturally the EQ6 has a higher payload.
Tracking is pretty smooth and predictable, so I would imagine autoguiding would work pretty well (provided you set the mount up to correct only in one direction in DEC due to the backlash problem). The Dec backlash problem is a well known problem but can be worked around (i.e ensure the mount corrects in one direction if autoguiding). At 2000mm Focal length on a C8 I can do 45second exposures unguided, with about a 80% keeper rate. At 1400mm with a focal reducer this improves to 60+ seconds. Handles the C8 with ease actually.
There is a freely available ASCOM driver available for the sphinx that works really well. One of my projects at the moment is to do PE correction via the ASCOM driver.
Terry
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