Re: [OM] Lens Tests - redos with OM-2S

[Gary Reese]

I wrote about the Canon FD 35mm f/2 and the first version of the 50mm
f/2 Summicron-M:

<< Both used thorium floride. >>

Oops, the latter used Lanthium, which I believe was also used in the
Aero Ektars.  For more on this interesting subject, see Kingslake's
"History of Photographic Optics."

Gary Reese
Las Vegas, NV


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