Here are the two blanks Schott Suprax 8488 ready for polishing. They are 456 mm in diameter (to have a useful diameter of 450 mm) and 50 mm thick. They will be processed with parabolic shape at f/3. These mirrors are made for the first two prototypes of TI 45 Astrographs.
Two 450 mm (17.72 inch) Astrographs to be tested in Spring 2014 
Due blanks in Schott Suprax pronti per la lucidatura!
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Will you have any ti45 scopes to see at the New Mexico office? I travel through there and would be interested to see.
Thanks,
Robert
Dear Mr. Robert, Do you have received our reply in PM?
Thanks,
Leonardo