And to further prove the theory of production code switch from under the
focus rubber to the back of the lenses: I have a 135mm macro coded G06
(06/1980), 300mm coded K12 (02/1981), 28-48 zoom coded B23 (03/1982), from
1983 on everything is in the XX34 format on the back of the lens. Maybe we
knew this already:).
All the best,
Iwert
Op wo 13 dec 2023 om 09:15 schreef Iwert Bernakiewicz <iwert.bcz@xxxxxxxxx>:
> Hello everybody,
>
> Going through my lenses and the production date codes something left me
> wondering:
>
> Before 1981 the codes would be under the focussing rubber on the lenses,
> where the first letter stands for the factory plant, the second for the
> year, the third for the month.
> After 1981 it would be the first two letters for plant, the third for the
> year, the fourth for the month.
>
> Before 81, it would be that 2= 1072, 3= 1973, 4=1974 etc..., but I have a
> black-nosed 28mm f2 without MC on the name ring and the 'improved parts
> construction' as seen in the exploded parts diagram, indicating production
> after circa 1981, with a date code E24 under the focussing rubber, that
> would mean this lens was produced in April 1972, which does not make sense,
> since it was only produced from 1973 onwards and at that time all lenses
> were silver nosed.
>
> Could it be that the first coding only really started in 1973, and ran
> till 1982, where 3= 1973, 0= 1980, 1= 1981, 2= 1982, and the new coding
> started from 1983. That would make sense in this case. I have the second
> white coding on my lenses starting from 1983, but none with an A or B
> indicating production in 1981 or 1982. But I only have a set of 24 of
> lenses coded this way to get data from. Another possibility: older
> factories than the then new Tatsuno plant still used the old code until
> 1982, and the two systems were used in parallel for a short time.
>
> Those questions a mind can come up with... as if nothing more important
> exists:). I'm living a luxurious life apparently.
>
> All the best,
>
> Iwert
>
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