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Thanks guys..I think I found an easy solution - The Orion Camera Adapter for 2" eyepiece holder. You can screw the barrel out and screw it directly onto the back of the reducer - good design!
This should put me back closer to the reducer's sweet spot.
Actually, at f4.8 the C8 does a suprisingly good job. The attached image is the full frame from a QHY9 image of globular NGC6937 made in this configuration. The corners fall apart a bit..but the centre square crop is OK.
Terry
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