Orion you must get some great DS views out of that beasty.
I have a couple of questions for you .
I am in the early stages of building my observatory for my 12.5" f6 Newtonian (two posts in
)and have designed the observatory to take up to an 18" (I hope) .
What is the overall length of the OTA ?
Do you know roughly what the distance from the balance point to the frount of the OTA is ?
What's the coma like at f4.5 and do you use a Comacorr ?
I am not is the immediate market to upgrade yet but I know what apperature fever is like , it pays to plan ahead !
Mark