woodplane
Joined: 20 Sep 2005 Posts: 33 Location: Chicago
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Posted: Tue Feb 26, 2008 6:55 am Post subject: Bausch & Lomb 8-1/4" f/4.5 1:1 Mag |
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Hi all,
At the aforementioned estate sale, I picked up 3 of the lenses listed in the subject line. Each lens has some white paint-printed lettering on the rear element tube as follows:
+6 AUG 10 1964
+16 JAN 10 1964
+7 OCT 18 1962
The dates are obvious enough, but what about the +xx? Does this describe some level of correction? Might these be product development test lenses?
Thanks,
Scott |
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