Re: [ATM] Detecting Astig in Ronchi images

[Jim Burrows <burrjaw@earthlink.net>]

At 2006-02-17 09:58 -0600, Stephen Koehler wrote:

>I can see the "leaning line" effect, but it is not nearly as
>pronounced as in my simulation.  What grating did you use for this,
>100 lpi or 50 lpi?

Jeeze, even Ronchi needs a reference.  You'll need a sphere with no 
astigmatism (on-glass or from test stand) to find the angle of the grating 
to see how much the lines have leaned due to astigmatism on the test piece, 
right?

         -- Jim Burrows
         -- mailto://burrjaw@earthlink.net
         -- http://home.earthlink.net/~burrjaw
         -- Seattle N47.4723 W122.3662 (WGS84)  

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