Re: [ATM] ATM Foucault images

["James Lerch" <jlerch1@tampabay.rr.com>]

----- Original Message ----- 
From: "Stephen Koehler" <s.c.koehler@gmail.com>
>
> I know that James Lerch has directly worked astigmatism in the past.
> I'm pretty sure he did it using a 2D surface map from interferometry,
> however.  That gives you MUCH more information to work with.

Indeed, we call it "color by numbers" now :)

After testing w/ interferometry, we print out a 1:1 scale image and place it 
underneath the optic while polishing TOT, or taped to the top side of the optic 
while working MOT.  While walking the barrel, special attention is given to the 
high spots.

Here's an animation of one such iteration:

http://lerch.no-ip.com/atm/Inter/Fringes_and_Foucault/251x2629_Raffle_Scope_2004/Fix_Astig/Fix_Astig.gif

or a shorter link if needed:

http://tinyurl.com/mkusc

Take Care,
James Lerch
http://lerch.no-ip.com/atm (My telescope construction,testing, and coating site)
http://lerch.no-ip.com/ChangFa_Gen (My 15KW generator project)

"Anything that can happen, will happen" -Stephen Pollock from:
"Particle Physics for Non-Physicists: A Tour of the Microcosmos"

" Press on: nothing in the world can take the place of perseverance.
Talent will not; nothing is more common than unsuccessful men with talent.
Genius will not; unrewarded genius is almost a proverb.
Education will not; the world is full of educated derelicts.
Persistence and determination alone are omnipotent. "
                                                           Calvin Coolidge 

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