Peter, I think Richard K explained several times a
possible cause: Tessar design limits, they
manufactured Tessar for 3 decades but never a Tessar
2.8/80 for the 6x6 format, it seems 2.8/80 is an
extreme design limit for this lens type and then the
optical design and glasses must be very exact. Zeiss
manufactured the Tessar 2.8/60 for the 4x4 however the
increased focal length from 60mm to 80mm increased the
problems too and it seems they could solve the main
design problems for 1938 when Rollei started to
develop the 2.8A prototype, but you know this lens
never was %100 satisfactory, for the reasons Richard K
explained several times .-
All the best
Carlos
--- "Peter K." <peterk727@xxxxxxxxx> escribió:
> Carlos,
>
> Very interesting. Seems odd though that having been
> building Tessars for 3+
> decades that CZJ would have had issues at this time.
> Do you know any reason
> why this would have happened?
>
> Marc, any input?
>
> Peter K
>
>
> On 11/14/06, Carlos Manuel Freaza
> <cmfreaza@xxxxxxxxxxxx> wrote:
> >
> > Marc:
> > On 1934 CZJ developed a Tessar 2.8/80 lens
> > prototype for the Rolleiflex Standard, but it had
> bad
> > quality and F&H rejected the lens.
> > On 1938 CZJ re-designed the Tessar 2.8/80 and this
> > time F&H accepted the lens performance developing
> the
> > 1939 Rolleiflex 2.8A 2.8/80 prototype (PR 149) but
> the
> > production couldn't begin due to the war, this
> protype
> > was the basis for the 1948 2.8A prototype with
> some
> > changes.
> > I think it's evident the 1938 and 1939 Tessars
> 2.8/80
> > were bought for the 1939 prototype commercial
> > production and it did not happen due to the war.
> >
> > All the best
> > Carlos
> >
> > --- Marc James Small <marcsmall@xxxxxxxxxxx>
> > escribió:
> >
> > I have no explanation for the
> > > existence of the Prewar 2.8/8cm CZJ Tessars --
> > > the first Rolleiflex batch was of only 2 lenses
> > > and was completed on 2 FEB 1938; the other
> > > Rolleiflex batches date from the first half of
> > > 1939. The Ikoflex lenses all date from 1939
> save
> > > for the final batch of 3 which 29 DEC 1941
> during
> > > the heart of the war years. All of the Prewar
> > > lenses were produced to a design dated 27 JAN
> > > 1933 but, for that matter, ALL Prewar 2.8/8cm
> CZJ
> > > Tessars were produced to that design save for a
> > > single batch of 2 lenses for the Super Ikonta
> > > B/BX made to a design dated 20 SEP 1938, but
> that
> > > was clearly a test for a planned upgrade which
> > > did not occur because of the war.
> > >
> > > We do know that Franke & Heidecke was
> > > substantially concerned over Zeiss Ikon's move
> > > from the f/3.5 Tessar in the Ikoflex II and
> > > II/III to the f/2.8 lens in the Ikoflex III and
> > > probably intended to follow suit, though this
> was
> > > precluded for some years because of the outbreak
> > > of War. I would suspect that F&H caboosed their
> > > order onto the Zeiss Ikon order, as eight of
> > > these blocks were made in unison in four linked
> > > groups and were finished on the same day,
> > > probably so that both Zeiss Ikon and F&H enjoyed
> > > a price break from production economics. I do
> > > not have any Rolleiflex 2.8 lens numbers handy,
> > > so I cannot be certain of this, but it would
> seem
> > > that the lenses used in the 2.8 came from lenses
> > > ordered by Rolleiflex and not from left-over
> > > Ikoflex III lenses. Here is a precis of these
> ten
> > > bocks:
> > >
> > > 1 309 988 to 1 309 989 2 lenses
> Rolleiflex
> > > 1 FEB 1938
> > >
> > > 2 309 601 to 2 310 600 1000 lenses Ikoflex
> III
> > > 3 JAN 1939
> > > 2 310 601 to 2 311 600 1000 lenses
> Rolleiflex
> > > 3 JAN 1939
> > >
> > > 2 446 301 to 2 448 300 2000 lenses Ikoflex
> III
> > > 17 APR 1939
> > > 2 448 301 to 2 449 300 1000 lenses
> Rolleiflex
> > > 17 APR 1939
> > >
> > > 2 581 001 to 2 582 000 1000 lenses Ikoflex
> III
> > > 15 JUN 1939
> > > 2 582 001 to 2 582 000 1000 lenses
> Rolleiflex
> > > 15 JUN 1939
> > >
> > > 2 602 101 to 2 603 100 1000 lenses Ikoflex
> III
> > > 18 JUL 1939
> > > 2 603 101 to 2 605 100 2000 lenses
> Rolleiflex
> > > 18 JUL 1939
> > >
> > > 2 790 310 to 2 790 312 3 lenses Ikoflex
> III
> > > 29 DEC 1941
> > > (the last batch is recorded as being "MUSTER",
> or
> > > a sample lot, perhaps made as a training
> exercize of
> > > some sort.)
> > >
> > > We do not know the production run of Ikoflex III
> > > cameras as such records were destroyed,
> > > apparently, in the Dresden Fire-Storm, but it
> > > must have been small -- the camera was only
> > > introduced at the Leipzig-Meße in April, 1939,
> > > and was no longer being actively sold by early
> > > 1940, though Carl Zeiss, USA, still seems to
> have
> > > had some unsold stock on its shelves as of 1 OCT
> > > 1941 -- at the hefty price-tag of $219. I would
> > > guess that less than a thousand cameras were
> > > marketed, but it might have been twice that --
> no
> > > one knows for certain.
> > >
> > > The Zeiss-Opton lens is a simpler story,
> > > indeed. There were three batches produced at
> > > Oberkochen:
> > >
> > > 535 001 to 540,000 5000 lenses 1950
> > > 570 001 to 573 000 3000 lenses 1950
> > > 782 384 to ? 500 lenses? 1953
> > >
> > > There is no design information available on the
> > > 1950 lenses, but the 1953 batch was made to a
> > > design dated 28 APR 1951. 9,870 2.8's were
> > > manufactured.
> > >
> > > We have a total of 10,005 CZJ lenses and 8500 ZO
> > > lenses, for a total of 18,505 lenses intended
> for
> > > use on cameras with a total production of 12,000
> or
> > > less.
> > >
> > > Marc
> > >
> > >
> > > msmall@xxxxxxxxxxxx
> > > Cha robh bàs fir gun ghràs fir!
> > >
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> > >
> >
> >
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