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CNers have asked about a donation box for Cloudy Nights over the years, so here you go. Donation is not required by any means, so please enjoy your stay.
Dec 17 2009 11:30 AM | David E in Eyepieces
The prodigiously popular Plossl is a perennial pick with astronomers, young and old. Invented in mid-1800 by G. S. Plossl of Austria, it is one of the oldest eyepiece designs still readily available. His design, however, remained obscure for
Sep 15 2005 06:44 AM | Clive Gibbons in Eyepieces
First off, I'll admit to being a lover of old optics. Vintage scopes and accessories hold a special appeal to me. So, when I was clearing out some old space at work the other day and found something that looked tarnished and brassy,