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I have had these exact same issues with the Lunt 35Tha and ASI120. Reaching focus was just possible by using the ASI's low profile face plate that came with the camera, and the Newton rings could be reduced by binning and/or barlowing but I liked neither very much. Also, the 120's FoV was just a little too small to fit the full disk. Overall it's manageable but I wasn't overly thrilled. Prom photos are easier with this combo though. And yes, the colour cam may not have the newton ring issue. Ken (Merlin66) is working on the flats solution, so watch his threads too.
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