[ATM] figuring an ultra-thin 16" mirror

[GREILING Yan <yan.greiling@eurocontrol.int>]

This mirror is made out of plate glass, it is f/4.5 and the center thickness
is 1/2 inch.
I have tried to figure it using the "classic" method (at least in France):
full size tool, mirror on TOP, long wide strokes. But I could never achieved
more than 8mm of difference of radius between inner and outer zones, while I
need 11mm. The mirror may be too light, or too flexible.
I wich to know if some of you have already encountered a similar problem.

Yan Greiling

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