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The advantage of a newt is no CA
The disadvantage of a newt is coma, especially at f4. I hope you have factored in an expensive coma correction solution.
I have a seldom used 8" f8 astrograph. The long focal length means it is almost coma free, the long focal length means it's a logistical problem in my small ob to swing it around as it is nearly 1.6 meters long.
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