I have a 16" parabolic mirror - 3" thick pyrex - roughly 132" FL - it needs re-coated but seems OK.
Calculating the mount for such a mirror, it is clear that it will deform significantly even with a very complicated arrangement of support.
Has anyone tried "re-machining" a mirror like this into more of a truncated conical back? I calculate that I could remove more than 12 lbs off of the 45 lb mirror but am not sure what that would do to the shape of the front.
In theory, it would be easier to mount and would cool faster?