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Re: ATM Foucault test accuracy
At 09:41 PM 6/3/01 -0400, you wrote:
>
>I've not found this to be the case. I like to do at least a half darkened
image. Sometimes I
>like to nudge the tester and see if both sides 'wink out' at the same
>time. On steeper zones I've noticed you can see the shawdow start
>coming in from the outside at the same time.
Geez Ken,
I do exacty these same things; I thought that was what everyone did. No
one has ever shown me how to do a "proper" focault test. I can't help but
wonder how an individuals technique impacts on the results.
Wasn't there a time when a mirror or two and their respective masks were
circulated amongt the ATM membership and results from each tester posted?
Frank Schiralli, Jr.
Member, Astronomical Society of Long Island (ASLI) and Amateur Observers
Society (AOS)
Minor Planet Center #928
AstroArt/MX916 Web Pg. (under construction):
http://members.tripod.com/~AstroImager/BestWeb.html