-snip
Interestingly, besides the 180/2.8 (113xxx-2000xx), also the numbers for
the 85/2 (127xxx to 2xxxxx) changed dramatically (and this was long
after the 6/4 to 5/4 transition), and this might have occurred at the
same time (1983/84). The late samples of both lenses (as many others)
have a "TNT" code at the back (which I like to interpret that they were
manufactured at the 1981 opened Tatsuno plant). Might be that the S/N
change just reflects some new manufacturing techniques (Tatsuno is
described to have invented highly automated production) and earlier
samples were produced somewhere else?
Konrad
In that case it may be no more than setting aside a block of serial
numbers for the new location especially if the production contract
was not finished at the old location.
--
Winsor Crosby
Long Beach, California
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