From: "James Lerch" 
To: "Ken Hunter" , "ATM List"
,
   
Reply-To: "James Lerch" 


----- Original Message -----
From: "Ken Hunter" 
>
> Wouldn't you divide the wavelength (~550nm) into the mm defocused to get
wavelength defocussed?
>
> Ken Hunter

Hi Ken,

I thought that would have been the answer as well, but nope :0

I finally wrote to Cor Berrevoets (Author of Aberrator) and got the
following answer (which he got from Suiter's book)

Focus (waves) = focus (mm) / (focalratio*focalratio*8*550e-6)

James

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