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Re: ATM Spherometer interpreting results help!!


What's the diameter ?
Here's a web calculator for sagitta.
...... with a drill bit chart for the measurement under a straightedge
http://www.atmsite.org/contrib/Prewitt/sagitta/

               Bill Prewitt

My webpage of telescope making and caving
http://home.neo.rr.com/imaging
----- Original Message ----- 
From: "Ken" <klowther@cisnet.com>
To: <Viper71049@aol.com>; <atm@shore.net>
Sent: Thursday, June 28, 2001 10:36 PM
Subject: Re: ATM Spherometer interpreting results help!!


> 
> On Thursday 28 June 2001 16:21, Viper71049@aol.com wrote:
> 
> >
> > I thought the sagitta of an F/2.31 would be like .12" or something close to
> > it. How would I get the real sagitta of the mirror instead of the reading?
> >
> 
> I can't find my formula at the moment.  If you don't get an answer back, let 
> me know and I'll dig deeper.
> 
> Ken
> 
>