RE: [ATM] Another Astigmatism question, but at the sphere stage

["Jerry" <wa4guu@verizon.net>]

We don't just seem to be we, well I have been.

I knew this would come up. I actually intended to ask about this after
settling the question of whether (careful now) defects in the figure of
revolution can bee seen in Foucault. 

What would be the proper term for the shapes and the aberration caused by
these different defects?

What would be the proper terms regarding the shape of Mirror C of the "Round
Robin Test Mirrors"? What parts of the shape are astigmatism, general
asymmetry, and localized defects? 
Jerry

-----Original Message-----
From: Michael Peck
 
At 18:31 8/29/05, Jerry wrote:
>. These irregularities from
>local figuring have to be small in magnitude and behind the diagonal for
the
>most part but that is astigmatism.
>

You guys seem to be using the word astigmatism as a synonym for 
general asymmetric or even localized defects. That's a really 
unfortunate amateur habit.

Mike Peck


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Michael Peck
email mpeck1@ix.netcom.com
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Amateur telescope making
http://home.earthlink.net/~mlpeck54/astro/astro.html 

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