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I have emailed Moonlite to find a bit more info about one of their focusers. The larger format SCT one (2.5") does not have an off the shelf flange for the 2" SCT thread, but it has an adjustable positioner for fitting a reducer inside it's drawtube that might give me range of adjustment to get it all together with my existing TOAG and camera spacers. I am currently using less than 105mm reducer to sensor distance, it gives more like 0.68 reduction but also suffers less coma and vignetting at the edge of the field.
The 2" version had the right flange available for my OTA, but the reducer threads on to the scope end of the drawtube, by the time I thread the TOAG on the end and then the camera with the spacers required to get guide and imaging cameras in focus together it will be more like 150mm spacing. More reduction, significantly bigger FOV but probably spectacular vignetting and coma.
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