Probably not metric ones!
Op wo 13 dec 2023 om 17:42 schreef Piers Hemy <piers@xxxxxxxx>:
> 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/
>
>
--
_________________________________________________________________
Options: http://lists.thomasclausen.net/mailman/listinfo/olympus
Archives: http://lists.thomasclausen.net/mailman/private/olympus/
Themed Olympus Photo Exhibition: http://www.tope.nl/
|