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Re: [ATM] Is this Sphere good enough?

To: Don Bates <dbates59@yahoo.com>, ATM@atmlist.net
Subject: Re: [ATM] Is this Sphere good enough?
From: Michael Lindner <mikell@optonline.net>
Date: Tue, 17 Aug 2004 16:39:05 -0400
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On Tuesday 17 August 2004 03:47 pm, Don Bates wrote:
> I am in the process of re-figuring a 10" f/6.6 x 7/8"
> thick plate glass primary. It originally had a bad
> turned edge which I have pretty much eliminated as
> best I can tell. I have read several posting regarding
> the importance of reaching a good sphere before
> attempting to parabolize.

Listen to Mel's advice..."the mirror does NOT have to spherical". Put in a 
parabola instead of a sphere and start figuring. If you have a high center 
and edge relative to a sphere you have a ways to go.

-- 
Michael Lindner
http://www.starastronomy.org *** http://home.att.net/~mikel
http://www.atmsite.org *** http://www.atmlist.net

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References:
- [ATM] Is this Sphere good enough?
  - From: Don Bates <dbates59@yahoo.com>

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