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Thanks Greg, Keith and Carl for the comments. I'll try and put your comments into action.
The scope I used was a 10" SCT with f6.3 focal reducer. The scope is about 15 years old and a real freak as far as I'm concerned. I get a flat field from it, focus once per imaging run (that includes meridian flips) and there is very little mirror shift when focusing. The contrast and detail I can get with it are great. It was the first scope I ever owned and I'll never sell it.
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