Re: ATM Foucault Follies and Equilibration Anxieties

["James W. Burrows" <burrjaw@halcyon.com>]

At 21:36 1998-12-18 -0700, Roger Ceragioli wrote:

>I have recently been refiguring a 6-in. f/4 mirror for the practice, since
>it formerly had a rough surface and a marginal figure, which was 1/4 wave
>overcorrected.  Using a Foucault tester with a slit and moving source, I
>was able to get what I thought was an excellent figure--at least that's
>what the numbers and the analysis were saying.
>But then I star tested...

f/4 is too fast for Foucault.  Betcha you'd get better comparisons between
caustic tests and star tests.



        -- Jim Burrows          phone 206.244.2933, fax .0294
        --                      mailto:burrjaw@halcyon.com
        -- Seattle              N47.4722, W122.3661 (WGS84)