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
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What if the Hokey Pokey *IS* what it's all about?
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