Your interpretation seems reasonable. It seems I have a ens which
was manufactured in another plant.
This are the codes on some of my lenses:
SAD3 -> 1983/Mar
NID7 -> 1983/Jul This is 40mm/F2.0 #6333, seems possible
TND8 -> 1983/Aug
SAEA -> 1984/Okt
TNEC -> 1984/Dec
I guess they used 1-9 for Jan-Sept and A-C for Okt-Dez.
So If there is a code with more than a C in th last 'digit' this Theory is
faulted.
When assuming the labeling started with 1980 as year A the following results:
A 1980
B 81
C 82
D 83
E 84
F 1985
G 85
H 86
I 87
J 88
K 89
L 1990
M 91
N 92
O 93
P 94
Q 1995
R 96
S 97
T 98
U 99
V 2000
W 01
X 02
Y 03
Z 04
Which could be possible. very fascinating.
Seems the Zuiko production is planed
to last until 2004 ? <g>
Frieder Faig
On Thu, Sep 14, 2000 at 10:31:25AM -0500, Jim Terazawa wrote:
> Last night I spent some time looking at the flange or the collar near
> the rear element of my Zuiko lenses that had stamps. The followings
> were observed:
>
> TNQA
> TNH1
> TNR2
> TNIC
> TNO5
> TNO8
> TNT1
> SAG7
> SAG6
>
> I then looked at Lee Hawkins' OM FAQ at:
> http://brashear.phys.appstate.edu/lhawkins
> B21) How can I tell when my OM-{1(N), 2(N), 10} was assembled
> to try to figure out code scheme commonality between the
> OM bodies and Zuiko lenses.
>
> I then went to the Olympus Japan website
> http://www.olympus.co.jp/Profile/
> to figure out the lens assembly plant.
> I found that there are two plants that assemble lenses
> (the website does not specifically say Zuiko, but
> lens assembly is one of the operations). One plant
> that assemble the lens are by the names of Tatsuno
> and the other one is Sakaki (subsidiary).
> http://www.olympus.co.jp/Profile/Oljpn/tatsuno.html
> http://www.olympus.co.jp/Profile/Subsidiary/sakaki.html
>
> So, I assume first two characters are plant code.
> I also assume the fourth alpha numeric from left
> signify month - "A" means October. However,
> I am not sure how the year is coded. Can "A"
> mean 1980 or starting of year coding ? If so,
> the newest lens assemble in above list is code
> TNT1 - Tatsuno Plant, 1999, January. I bought
> this lens brand new in August this year.
> Maybe John Hermanson can chip in.
>
> Jim Terazawa
>
>
> frieder.faig@xxxxxxxxxxxxxxxxxxxxxxxxx wrote:
>
> > On Tue, Sep 12, 2000 at 12:36:24AM +0000, Giles wrote:
> > >
> > > More recent lenses, at a guess I would say those manufactured in the
> > > 80's, already hava date code on them in the form of a group of white
> > > letters near the rear element. These letters denote the particular
> > > factory which made the lens and the year and month.
> > >
> > interesting, does such a code look like `SAD3' or 'TND8' ?
> > -But What`s the year, and what`s the month? - Are there
> > any informations available how to decode this letters, or are all
> > of my Zuiko`s pretty old? - Hmm, the only one I bought new
> > in 1995 - doesn`t even have any letter near the rear element,
> > guess the dealer was pretty happy finally selling it to me.... ;-).
> >
> > Frieder Faig
> >
>
>
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