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You are absolutly right Greg. Square format arrays would be nice with this scope to fill a 40mm image circle. I also forgot to mention that there are 4 adjustments on the backplate that will allow for tip-tilt to square your camera if needed. Something that will be real critical at f/3
I don't think an off-axis guider is needed for this system. All of the beta tested images were done with a small guidescope.
The RH-200 sure remindes me of my old Celestron 8-inch Schmidt Camera that I used for my deep red exposures on Tech Pan.
The RH-200 will be over $9000 USD if you add the FLI Atlas focuser to it which I would suggest as mandatory due to the very narrow critical focus zone.
jg
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