To: "Chris Feller" ,atm{at}shore.net
From: Mark Suchting 
Reply-To: Mark Suchting 


At 10:31 PM 9/01/2003 -0600, Chris Feller wrote:


>My question is how good does the figure have to be to get good results.


Chris

Forget knife edge readings.  You are producing a reference element for a
Null test.  Figure the mirror until you see a clean `cut off' with the
knife edge. If you can't achieve that , then you are getting ahead of
yourself in wanting to progress to Null testing IMHO.

~Mark

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