From: "Vladimir Galogaza" 
To: "ATM shore" 
Reply-To: "Vladimir Galogaza" 


James,

>wondering about astigmatism, and how it may appear when testing across
three
diameters.

>Since I'd never really seen what this level of astigmatism  under the
Foucault
>knife, I took a lot of pictures and made some animations to share with the
list.
>I hope you find them interesting:

It is possible by using James Burrows "Diffract" (Foucault shadow
simulator) to introduce various degrees of astigmatism ( choice of Zernike
coefficients)
and see how it will look like in Foucault test.

This simulation is based on wave optics, is interactive,  capable to
satisfy plenty of curiosity, gives lot of learning opportunity and is as
close to the fabulous "free lunch" as you can get. (See
http://home.earthlink.net/~burrjaw )


Vladimir.

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