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Re: [ATM] Reducing the outer zone in figuring

To: <atm@atmlist.net>, <melockwo@uiuc.edu>
Subject: Re: [ATM] Reducing the outer zone in figuring
From: "Arjan te Marvelde" <arjan.te.marvelde@hetnet.nl>
Date: Fri, 11 May 2007 17:49:57 +0200
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Hello Mike,

> That "trailing edge pressure" stroke is meant to fix an oblate sphere 
> (let's call that condition negative correction), and is not meant for 
> use on a mirror that's elliptical or nearly parabolic (positive 
> correction).
> 
> What is the figure of the mirror you're working on?

Well, I managed to correct the high edge ... but now it is rolled down.
See http://home.hetnet.nl/~artm/atm/travel2/figure.html

It's 250mm F/6.3, and should ideally become a paraboloid.
I guess I'll have to bring down 70-90% zone.

   Arjan te Marvelde


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