[ATM] Re: ATM How fast is too fast?

[Hugues.Laroche@ses-astra.com]

Hi,

Bob, I am a little confused.

>With a F2, your flat is about 1/2 the size of the primary just 
>to get the image to the edge of the input beam 
<SNIP>
>With a F3, 1/3 of the diameter of the priimary 

I would have said that the figures to just get the central
point of the focal plane fully illuminated are half these,
but I might be wrong.

Of course, if you want a given fully illuminated area
(in mm or in), then the big scopes have an advantage over 
the small ones of same focal ratio.

Happy ATMing...

Hugues
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