BTW, the other things u guys may or may not be considering is that being able to sit down while looking thru the eyepiece adds a pseudo-inch or two to the diameter. Initially I was gonna go for a 10" f/6 Orion but York Optical didn't have it in stock so I went for the 8" They were like the largest available for a decent price back then. So yeah, don't worry too much. in the 80s everyone had a 6" reflector and that was considered pretty decent.
So yeah, I can't imagine sketching without being able to actually sit down, so consider that lol.
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