If you want to read the original patent for this lens (and the source of much
of the info in Marco's article), here it is:
http://tinyurl.com/23bufp4
There's a lot of interesting Olympus patents out there. I found the ones for
the 18 (2 different ones, at different times actually), 24shift, 21/2 and a
28/1.4 with plastic aspherical element (that was never released,
unfortunately).
Patents make pretty interesting reading as far as lenses go.
-Ed
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