Re: [ATM] Source for Cassegrain secondary blank?

["Jerry" <wa4guu@verizon.net>]

One source would be the Torus ATM Surplus Store on ebay.

I see he has 1, 2, 3, and 4 inch blanks

Jerry

-----Original Message-----
From: atm-bounces@atmlist.net [mailto:atm-bounces@atmlist.net] On Behalf Of
Jeff Bottman
Sent: Monday, January 14, 2008 8:00 PM
To: atm@atmlist.net
Subject: [ATM] Source for Cassegrain secondary blank?

Greetings all,

I have made a few Newtonian telescopes, including the mirrors, and have
settled on a 10 inch Dall-Kirkham Cassegrain as a very interesting next
project. (To be used for planet/moon imaging)

Does anyone know of a good source for pyrex blanks in the range 2 to 3
inches, for the secondary? I would actually need 2, for the purpose of
fringe testing to assure sphericity.

Thanks,
Jeff Bottman
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