Re: [ATM] [atm_free] RE: data and musings on thin mirror

["vladimir sacek" <vla@toast.net>]

Stephen Koehler wrote:

> I think the test for basic correction can be done without a need to
> know the absolute distance inside or outside of focus that the Ronchi
> image was taken, as long as you know the line spacing on the grating. 
 
I don't think that would work. Given everything else, line deformation is 
a function of both, nominal defocus (aberration) and nominal grating 
separation. Since any given pattern deformation can be result of an 
indefinite number of combinations of the two parameters, we need to 
know one in order to determine the other one.

Vlad
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