I have owned for an old F7 8" Newtonian Reflector from Amateur Astronomers' Supply Company In Crows for many years. I also own a 12" Meade Dobsonian trust newtonian that I bought from Bintel a few years ago.
Is the new mass produced 12" mirror in my Dob the same parabolic shape of my ancient 8", hand-made Pyrex mirror in my AASC Newtonian ? Or is it spherical ?
