But what codes were used by the Wyoming factory?
Piers
On Wed, 13 Dec 2023, 14:15 Iwert Bernakiewicz, <iwert.bcz@xxxxxxxxx> wrote:
> 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
> >
> --
> _________________________________________________________________
> Options: http://lists.thomasclausen.net/mailman/listinfo/olympus
> Archives: http://lists.thomasclausen.net/mailman/private/olympus/
> Themed Olympus Photo Exhibition: http://www.tope.nl/
>
>
--
_________________________________________________________________
Options: http://lists.thomasclausen.net/mailman/listinfo/olympus
Archives: http://lists.thomasclausen.net/mailman/private/olympus/
Themed Olympus Photo Exhibition: http://www.tope.nl/
|