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Somewhat interesting Glen ?
I found this on a Wise Geek Page :
Borosilicate glass can handle both extreme heat and cold, making it very popular for laboratory glassware and other scientific instruments. It also has a reduced rate of thermal expansion, which can make it useful for things like telescopes and other high precision lenses where the surface of the lens must be very even for a clear image to be obtained.
This leaves me asking Where did these lenses come from and/or who in particular made them ?
Also would also like to know what they were oridginaly designed for ?
The Bi/convex sounds mighty fast !
Rgrds
Bob
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