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Hi Alexandros
You can buy a GSO 16in f4.8 from Andrews Communications in Sydney, may save you the cost of freight from USA.
GSO have a good reputation for mirrors, I believe Meade use them in their scopes.
Regards
Bill
Edit: cant help you on the difference between BK7 and Pyrex though.
Last edited by billdan; 17-07-2012 at 11:36 AM.
Reason: further thoughts
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