The code goes like this:
2 letter code for factory (in the early 80s Olympus had 26 different
factory codes, though techs in the know at Woodbury NY said some of those
"factories" were small, more like "subcontractors").
TN may have been Oly's main OM factory = Tatsuno
Factory code is followed by a letter (represents year) and then a number
1-9 (month) OR x, y, or z. (X for Oct, Y for Nov, Z for December).
After factory code, an "A" would indicate 1981, "B" 1982, "C" 1983, "D"
1984 etc.
Number: 1 = January, 2 = February, 3 = March etc.
TND5 Tatsuno factory, 1984, May.
TNFY Tatsuno factory, 1986, November
"S" factory code is "old" code for "New" factory code NA, old code for TN
was "E".
In 1981, these factory codes were in use: TN, 1N, HJ, NA, S1, AZ, SA, FA,
NI, SK, IK, SY, MR, KW, SU, NN, SZ, NM, NK, TS, HW, SE, TH, CN, SR, SN.
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On Wed, Mar 6, 2019 at 5:50 PM Moose <olymoose@xxxxxxxxx> wrote:
> On 3/6/2019 8:19 AM, Jan Steinman wrote:
> >> From: Moose <olymoose@xxxxxxxxx <mailto:olymoose@xxxxxxxxx>>
> >>
> >> This may help. <
> https://www.photo.net/discuss/threads/deciphering-the-white-4-letter-code-on-om-equipment.76187/
> <
> https://www.photo.net/discuss/threads/deciphering-the-white-4-letter-code-on-om-equipment.76187/
> >>
> > Thanks. That’s what I used for figuring out the last two characters, but
> unless I missed something in there, it doesn’t go into the first two
> characters, which are supposed to be factory codes.
>
> ". . . I think it is safe to think that "TNxx" stands for Tatsuno . . .
> From the similar phonetics, it might be that OK
> stands for the Okaya-shi plant; NI for Nishigo-mura plant; SA for Sakaki
> plant."
>
> > Perhaps ALL the camera lenses were made in just one or two factories,
>
> This fellow found five different codes on his OM lenses. I note four
> overlaps, same lens model, different factory on
> casual scanning:
>
> TNxx: lenses 8/2.8, 21/2, 21/3.5, 24/3.5sh, 28/2.8, 35/2, 35/2.8,
> 35/2.8sh, 50/1.4, 85/2, 100/2, 100/2.8, 180/2.8, 200/4, 300/4.5,
> 350/2.8, 500/8, 35-70/3.6, 35-70/4, 35-70/4 AF, 35-80/2.8, 50-250/5,
> 65-200/4, 20/2 Macro, 38/2.8 Macro, 50/2 Macro, 50/3.5 Macro, 90/2
> Macro, 135/4.5 Macro, 1.4X-A, 2X-A; cameras: OM-4, OM-4T/Ti
>
> SAxx: lenses only, 24/2.8, 28/2.8, 50/1.8, 35-70/3.5-4.5, 35-70/4,
> 65-200/4, 50/3.5 Macro
>
> SKxx: 300/4.5
>
> NIxx: 40/2, 35-105/3.5-4.5
>
> IOxx: 1.4X-A
>
> > and they used the same date code system on their microscopes and medical
> equipment, too.
>
> That indeed seems likely, and would explain why only a few of their many
> factories show up in lens codes.
>
> Paying Attention Moose
>
> --
> What if the Hokey Pokey *IS* what it's all about?
> --
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>
>
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