[ATM] WG: Focault (sic!) Help
jrowley2 at msn.com
Fri May 28 03:22:26 JST 2010
Mike Coslo: "My favorite demonstration of Tex'ism is his pitch lap construction. I
suspect Tex might have been a little Obsessive-Compulsive."
This is funny to me because I almost did just what he outlines in an effort to do
everything just right (maybe I'm a little bit OCD), but finally decided it was just
too much. The line has to be drawn somewhere!
That being said, I have followed his book as well as I could. I have also followed
the advice of the list and what I have learned through private e-mails with people
on the list, and I think I am really on the right track. Despite some warnings I took
on a 10" as my first mirror, and I think I will have a sphere polished by the end of
this week and I think I have a pretty good idea of the various strokes that will get
me through parabolization. Here's crossed fingers for a smooth ride from here on out.
Thanks for all the advice, both in answer to my questions and all that I have gleaned
just by lurking.
Date: Thu, 27 May 2010 09:34:16 -0400
From: Michael Coslo <mjc5 at psu.edu>
To: <atm at atmlist.net>
Subject: Re: [ATM] WG: Focault (sic!) Help
Message-ID: <C823ED18.3FAA%mjc5 at psu.edu>
Content-Type: text/plain; charset="US-ASCII"
On 5/26/10 11:36 PM, "Anna Bergen" <polarbare56649 at gmail.com> wrote:
> Why not just MEASURE astig directly by tilting the aperture mask 45 degrees,
> nulling the knife edge, then tilting the mask 45 degrees the other way
> (without disturbing the mirror or tester) and measuring the change in the
> null. This seems a no-brainer. Of course you have to rotate the mirror
> 45 degrees in the test stand and repeat, to be sure of getting both the sine
> and the cosine components of the astig.
I rotated my mirror(s) constantly while under test. Hardest part about your
method will be making sure the mirror placement is the same. With a good
solid test setup this will work.
> I don't like all that narrowminded stuff from Texereau; he is really, really
> old fashioned and does not seem make people think about problems.
My favorite demonstration of Tex'ism is his pitch lap construction. I
suspect Tex might have been a little Obsessive-Compulsive.
- Mike -
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