Just a suggestion from a bonafide user of Newt reflectors for both visual and DSO imaging ….
How about an f6 and f5 Newt
I use 6” , 8” , 10” and 12”
Cost between $500 to $2500
Simple and cheap , a snack to collimate and a great all rounder from 750mm to 1250mm fl
If weight is an issue on an 8” or 10” you could go carbon fibre
My 10” is a carbon fibre, light as a feather
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