[AZ-Observing] Re: Eyepiece "Religions" -- More than you need to know

Here is a link to articles by Chris Lord about eyepieces, including a 
highly detailed paper and "family tree" illustrating the development of 
various designs.  Probably about the best source of information I've 
seen, except possibly for the earlier 1970s papers by the optical 
designer Richard Buchroeder analyzing various designs (not available on 
the web, so far as I know).
http://brayebrookobservatory.org/BrayObsWebSite/HOMEPAGE/BRAYOBS%20PUBLICATIONS.html#Eyepiece%20articles

(Watch out for word wrap on this very long URL....Go to 
brayebrookobservatory dot org and find the publications page, otherwise, 
and scroll down, look for "Evolution of the Astronomical Eyepiece"...)
Gene Lucas
(17250)

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