I think this must be the patent of interest
<http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&p=1&u=
%2Fnetahtml%2FPTO%2Fsearch-bool.html&r=23&f=G&l=50&co1=AND&d=PTXT&s1=coma
.ABTX.&s2=olympus.ASNM.&OS=ABST/coma+AND+AN/olympus&RS=ABST/coma+AND+AN/o
lympus>
------------------------------------------------------------------
Abstract
Yep, that must be it and presumptively the original reference to coma
was in regards to the floating
elements. Though there appears to be some truth to the coma statement,
it is an odd way of viewing the floating element function. Thanks for
locating that.
The newer 5/4 version appears to be only different with a single
element replacing a cemented doublet. Optical construction of two
versions shown here:
http://www.mir.com.my/rb/photography/hardwares/classics/olympusom1n2/shared/zuiko/htmls/85mm.htm
Still largely an Oly significant refinement of an old ernostar F2
style.
http://taunusreiter.de/Cameras/Biotar_en.html
Various very old designs seem to resurface in some capacity despite
supercomputing capability to aid optical construction with aberration
corrections..
Seems nature only provides so many permutations to efficiently correct
aberrations.
I think AF may have a very nice modern Cooke triplet lens --with all
the newest glass choices there are enough degrees of freedom to to
quite a nice job with 3 elements.
I haven't seen much written about some of the very complex MFT
offerings, but suspect they are no exception.
Olde is new, Mike
--
_________________________________________________________________
Options: http://lists.thomasclausen.net/mailman/listinfo/olympus
Archives: http://lists.thomasclausen.net/mailman/private/olympus/
Themed Olympus Photo Exhibition: http://www.tope.nl/
|