The original formulation was 6 elements/5 groups. The later version
replaced elements 2 and 3 (a cemented group) with a single element, giving
5elements/4 groups. The shape of the single element appears to be identical
with the double element of the original version.
As a matter of interest, the early lens group manual that I checked the
original lens design in also gives full details and pictures of such
mythical lenses as the 300mm/f6.3 and the 400mm/f4.5, as well as outline
pictures, and filter and lens cap sizes for the 500m/f5.6, the 800mm/f9,
and the 1200mm/f14.
Roger Key, Denmark
On Paul Farrar's excellent webpage concerning lenses at
http://www.ametro.net/~farrar/zuiko.html, a note is made
regarding the 85/2 of two variations: 5 elements & 4
groups, and 6 elements & 5 groups. Did anyone here buy
their 85/2 new and so have the technical sheet that lists
whether their lens is 5/4 or 6/5? I want to know which
is more recent, 5/4 or 6/5, so if you'll list the serial
number like 123XXX, maybe I get figure this out.
Pete
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