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Re: [ATM] 8" F/4.2 progress

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Subject: Re: [ATM] 8" F/4.2 progress
From: "Julio Sanchez" <jsanchez@skipanon.com>
Date: Fri, 28 Oct 2005 09:18:10 -0500
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I read that autocolimation with a flat is a possible substitute for a star
test. I do know that Foucault once said that a flat is like an artificial
sky. According to my source, all you need is an optical flat at least the
size of the primary. Also that a quarter wave flat is good enough for
autocolimation. The flat is actually a flat mirror since it has to be
aluminized (or silvered). I suppose the flat has to have a central hole.

Has anyone in the list actually build an autocolimation tester?

Regard,

Julio

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