Re: [ATM] testing a flat

[Dale Eason <atmpob@yahoo.com>]

If anyone is interested there have recently been
messages about the Raleigh Water test and a picture
posted in the files section on the Yahoo
interferometry group.  I'm sure you could get more
info on how to preform the test from that group.

Dale Eason

--- Jim Miller <jim@jtmiller.com> wrote:

> atmj had anl article about flat testing against the
> curvature of the earth 
> (pretty flat...) by using a water surface and a dob.
> one of the issues with 
> this of course is vibration wiggling the water. i
> think a interesting 
> enhancement would be to add a webcam at the eyepiece
> location and do some 
> frame sorting and averaging to work around the
> vibration issue.
> 
> the same issue had an article on roughness testing
> of curved mirrors which 
> can also be done using the same flat tester. herb
> highstone was the author 
> and i think he is usually on astromart fora.
> 
> just a thought...
> 
> jtm 
> 
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> ATM mailing list http://www.atmlist.net/
> 


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