Re: [ATM] Can Foucault Results Indicate Astigmatism?

[Mark Cowan <toolontop@yahoo.com>]

Hi Kurt:

The Foucault test is relatively blind to astigmatism,
but since you see no S shapped Ronchi lines and (I
assume) don't see a yin-yang pattern under Foucault
you can rest easy on that point.     Spread on the
test results looks good. 

It's awfully cool when the book starts to make sense
and you begin to see cause and effect working the
mirror. ;)

Cheers,
Mark Cowan
Salem, OR

--- Kurt Clement <kurt.clement@flashmail.com> wrote:
> Is the Foucault test able to detect astigmatism, and
> if so, what would 
> indicate it's presence?  I don't think I have any,
> and am nearly done with 
> my first mirror.  Ronchi tests do not indicate any S
> shaped lines in any 
> mirror orientation, 0, 90, 120, 180, 270.  I am
> using TEX and Foucault Test 
> Analysis 1c/Reifke, and they both indicate that I am
> at 1/8 or better and 
> 0.96 Strehl, using a three zone mask. <snip>


	
		
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