Quote:
Originally Posted by bartman
Rick, the side on pic of the mirror ( pic 2 and 3) show lateral banding and waves in the glass. Is this normal or due to the drop it had?
Just curious....
Bartman
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Bertman- The glass blanks with the wavy edge are made by Schott and material trade name is Suprax ( not to be confused with the new Supremax borosilcate available in thick sheets which is actually Schott Borofloat 33 ) . They have a coefficient of expansion somewhere in between Plate Glass and Borosilicates made by Corning ( eg. Pyrex).
I am not sure why the blank have not been diamond edged for release of strain and to to give a nice mechanical edge. Schott do not offer a fine- annealing service for Suprax, so I would assume that it was fine or precision -annealled by some third party. I have queried Orion on these matters in the past and didn't get a response. They do not say anything about the anneal of their optics on their web site. Perhaps a question on their forum might get a response.