Thread: Null test lens for a 30" F/4 mirror?
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Old March 4th 04, 04:13 AM
Richard F.L.R. Snashall
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Default Null test lens for a 30" F/4 mirror?


Lawrence Sayre wrote:

What size, quality, and specific type of lens would be required to
use a Foucault tester as a Ross Null Tester for a 30" ~f/4 mirror?
Does anyone make such a beast?

You may find there are multiple answers to this question. For example
(if you
have OSLO available to you):

http://users.rcn.com/rflrs/Ross_Test.len


Lawrence Sayre


--

Rick S.

http://users.rcn.com/rflrs



--

Rick S.

http://users.rcn.com/rflrs