Have you ever been mystified when a photo writer refers in passing to some famous but opaque term of optical design? Tessar, Planar, double-Gauss? If so, Roger Cicala at lensrentals.com has come to the rescue, with a very nicely organized and well presented brace of articles called "Lens Geneology." It seems to me to be adroitly simplified as much as possible but no more. There's a lot of work behind writing like that. Here's Part I and Part II.
And by the way, despite being organized around an obviously commercial enterprise (a useful one), lensrentals.com is becoming quite a nice site.
(Thanks to Maarten)
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Original contents copyright 2011 by Michael C. Johnston and/or the bylined author. All Rights Reserved.