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echo: atm
to: ATM
from: Shawn.McHatten{at}aliant.ca
date: 2003-07-18 08:59:22
subject: RE: ATM First Question (More)

From: "McHatten, Shawn" 
To: atm{at}shore.net
Reply-To: "McHatten, Shawn" 


Hey Gang
        This may sound goofy but the way I remember (and explain) the
difference between fast and slow objectives is, for any given aperture the
smaller f values gives a shorter focal length, therefore getting the light
to my eye "faster".
        It may not be how the term came about but I think it's technically
correct and easy to remember.

Thanks
Shawn

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