[ags_ (Phil)]

Originally Posted by John K

Gents,

Very interesting discussion - and another example of amateurs pushing some boundaries.

An interesting thread below FYI as well on edge support for sandwich style mirrors:

http://www.cloudynights.com/topic/48...support-ideas/

And some additional info here as well:

http://www.jpastrocraft.com/cells.htm

and a very interesting article here:

http://www.loptics.com/articles/mirr...orsupport.html

Interesting John, though many refer to Dob support the idea that edge can have more effect on the mirror than cell needs more thought. My top and bottom mirror plates are the same shape and size 508mm x 16mm.
After fusion of the pillars to both plates the second fusion is done with the mirror inverted over a mould allowing the mirror to slump to the correct shape F3.95 in my case which gives a FL 2008mm.

Update on my mirror from Normand, figuring is going well and now at 1 wave another week it will be ready.