From: "Bob May" 
To: "atmlist" 
Reply-To: "Bob May" 


You have to remember that the Airy EP was a minor improvement on a
primitive EP and it was quickly put aside as soon as the concepts of crown
and flint glasses making a color corrected design.  Today, with the advent
of actually ray tracing designs, the actual start of a particular design
can quickly go through the principals that other EPs were originally
designed to without the specific knowledge of the operator of the software.
 The big thing that Airy seems to have done is curve the two lenses go more
provide for the advantagous error correction from those changes. Bob May
http://nav.to/bobmay
bobmay{at}nethere.com
NEW! http://bobmay.astronomy.net

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