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Re: [ATM] Quartz blanks

In message <43E3F01D.3030703@uiuc.edu>, 
 Mike Lockwood <melockwo@uiuc.edu> wrote:

> I may be looking for a blank or two in the 20" range, ~1.25" thick. 
> The use is an astrograph primary (F/3) for a friend, and possibly a 
> Cass. primary for myself.
> 
> A pyrex mirror has a large focus shift with changing temperature, so 
> we are investigating lower-expansion substrates.  If the price is 
> astronomical we'll stick with Pyrex.

Only loosely related to Mike's actual request, but out of personal interest,
can anyone here give a specs comparison between quartz and Zerodur?

I am aiming at finishing 2 Zerodur 8" mirrors, the primaries of a classical
Cass and of a R-C.

Txs a lot.

Bernard, slowest glass pusher east of Mississipi ;-)

-- 
Bernard Maugoust 3°59'E 44°28'N

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