Darin wrote:
> I'd be interested in this decoding table also, when you can find it, or if
> someone else has it. I'm curious to know when the OM-4 I recently bought was
> made.
>
Here is Piers misplaced decoder ring:
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For later OM production the manufacturing date is marked as a
four/five-character white code usually on the rear of the lens, or in the
film chamber on the body. The first two characters indicate the assembly
plant, the last two/three the production year and month. The year code
starts with A=1981 (I think, reflecting the start of assembly at the new
Tatsuno plant).
At http://lists.tako.de/html/Olympus-OM/1999-02/msg00417.html , John
Hermanson provided this worked example: "TNE5 = Factory "TN", E = 5, 1985, 5
+ fifth month, May. May 1985."
A later thread starts here
http://lists.tako.de/html/Olympus-OM/2000-09/msg00983.html
It appears that a further refinement was added to the code, the extra
one/two digits (Day of assembly?) in some of the examples I have available
- but I don't own all of them :(
TNNC 21 OM-3Ti made in December 1994
TNO1 12 OM-3Ti made in January 1995
TNF54 OM-3 made in May 1986
TNF82 OM-4Ti made in August 1986
SUEA3 OM-PC made in October 1985
TNF4 50/2 made in April 1986
TNK3 50/1.2 made in March 1991
TNI2 24/3.5 made in February 1989
TNG8 100/2.8 made in August 1987
But I have several lenses which do not have any visible code (including my
50/1.4 which is an early s/n 223xxx)
Earlier production M-1, OM-1 and OM-2 bodies had slightly different date
codes, which are each documented on Mark's M-1 information page
http://olympus.dementia.org/M-1/ , and in the OM-FAQ
http://brashear.phys.appstate.edu/lhawkins/photo/olympus.faq.html at B21
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