[rollei_list] Re: 2.8F opton?
- From: Carlos Manuel Freaza <cmfreaza@xxxxxxxxxxxx>
- To: rollei_list@xxxxxxxxxxxxx
- Date: Sun, 6 Jul 2008 20:02:10 -0700 (PDT)
Eric, the Pentacon Six has a focal plane shutter, the Pentacon Six construction
allows to use a Biometar 2.8/80 five elments similar regarding the Bimoetar
used for the Rolleiflex 2.8B. The Hasselblad 500 does not have a focal plane
shutter, the lenses have built-in Compur central shutter and then they require
a more complex optical design, a retrofocus design for the normal lens as you
wrote.
The Biometar 2.8/80 five elements is the standard lens for the Pentacon Six and
it has excellent reputation.-
Carlos
--- El dom 6-jul-08, Eric Goldstein <egoldste@xxxxxxxxx> escribió:
> De: Eric Goldstein <egoldste@xxxxxxxxx>
> Asunto: [rollei_list] Re: 2.8F opton?
> Para: rollei_list@xxxxxxxxxxxxx
> Fecha: domingo, 6 de julio de 2008, 11:32 pm
> No need to be afraid, Carlos... it will all work out ;-)
>
> Thank you for the diagrams and the reminder... yes I do see
> now the
> similarity between the Xenotar and Biometar, but that does
> not explain
> the second part of my comment. Take a look at the
> retrofocus 80/2.8
> Planar on the Hasselblad... a seven element lens. It is
> unlikely that
> the Biometar retrofocus for the Praktica could be handled
> with the
> same design as the TLR Biometar, unless the Praktica design
> did not
> require a retrofocus design for this FL?
>
> Eric Goldstein
>
> --
>
> On 7/6/08, Carlos Manuel Freaza
> <cmfreaza@xxxxxxxxxxxx> wrote:
> > I'm afraid you are pretty confused Eric, the
> diagram is very right, it corresponds to the Biometar
> 2.8/80 almost identical regarding the Xenotar 2.8/80 five
> lements, the Planar 2.8/80 five elements has a different
> lens diagram, you can see the differences and the way
> Xenotar and Biometar are similars here (at the end of the
> page):
> >
> > http://www.foto.no/rolleiflex/Rollei-9.html
> >
> >
> > Carlos
> >
> >
> >
> > --- El dom 6-jul-08, Eric Goldstein
> <egoldste@xxxxxxxxx> escribió:
> >
> > > De: Eric Goldstein <egoldste@xxxxxxxxx>
> > > Asunto: [rollei_list] Re: 2.8F opton?
> > > Para: rollei_list@xxxxxxxxxxxxx
> >
> > > Fecha: domingo, 6 de julio de 2008, 10:40 pm
> >
> > > That is very interesting Carlos. Then I suspect
> this block
> > > diagram is incorrect:
> > >
> > >
> http://www.praktica-users.com/lens/p6lenses/czjbio2.8_80.html
> > >
> > > While it is possible that the Biometar used a
> Xenotar
> > > configuration
> > > for the Rolleiflex and a Planar configuration
> for the
> > > Praktica (which
> > > BTW likely needs a retrofocus lens), it is not
> too
> > > likely...
> > >
> > >
> > > Eric Goldstein
> > >
> > > --
> > >
> > > On 7/6/08, Carlos Manuel Freaza
> > > <cmfreaza@xxxxxxxxxxxx> wrote:
> > > > Excuse me Eric, it does not it true, this
> is form
> > > Todd:
> > > >
> > > > >I have just taken the lens apart again
> to confirm
> > > and I can categorically
> > > > >state that the 2.8 Biometar as found
> on the
> > > Rollei 2.8 B is not the same as
> > > > >the 2.8 Planar as found on the 2.8
> Rollei. The
> > > 2.8 Rollei Biometar has a
> > > > >single front element and a cemented
> doublet in
> > > front of the shutter - like
> > > > >the Xenotar.
> > > > >
> > > > >You can read as many books as you like
> to get
> > > information and come to a
> > > > >'logical' conclusion, but
> there is
> > > nothing like having the real thing in
> > > > >front of you to know for certain.
> > > > >
> > > > >todd
> > > > >
> > > >
> > > > BTW, I insist because I know about it, the
> Biometar
> > > 2.8/80 has to do with the Xenotar, not with the
> Planar.-
> > > >
> > > > Carlos
> > > >
> > > >
> > > > --- El dom 6-jul-08, Eric Goldstein
> > > <egoldste@xxxxxxxxx> escribió:
> > > >
> > > > > De: Eric Goldstein
> <egoldste@xxxxxxxxx>
> > > > > Asunto: [rollei_list] Re: 2.8F opton?
> > > > > Para: rollei_list@xxxxxxxxxxxxx
> > > > > Fecha: domingo, 6 de julio de 2008,
> 10:00 pm
> > > > > Richard -
> > > > >
> > > > > From the company history we have been
> told, it
> > > would seem
> > > > > that the
> > > > > Biometar on the 2.8 B and the Planar
> on the 2.8
> > > C are very
> > > > > similar in
> > > > > their construction...
> > > > >
> > > > > I'd be curious how the patent
> data say they
> > > differ.
> > > > >
> > > > >
> > > > > Eric Goldstein
> > > > >
> > > > > --
> > > > >
> > > > > On 7/6/08, Richard Knoppow
> > > <dickburk@xxxxxxxxxxxxx>
> > > > > wrote: (snipped)
> > > > >
> > > > > > The Biometar was indeed a
> five element
> > > lens of the
> > > > > Wynne type made by
> > > > > > VEB Zeiss. It is not the same as
> either the
> > > Planar or
> > > > > Xenotar. From the
> > > > > > patent data its a good lens. I
> think these
> > > are rather
> > > >
> > > > > rare on Rolleis and I
> > > > > > don't know if VEB Zeiss
> offered them
> > > for other
> > > > > cameras.
> > > >
> > > > > ---
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