[rollei_list] Re: 2.8F opton?
- From: "Eric Goldstein" <egoldste@xxxxxxxxx>
- To: rollei_list@xxxxxxxxxxxxx
- Date: Sun, 6 Jul 2008 23:08:25 -0400
Carlos -
The design of the shutter is not relevant in terms if what we are
discussing... the retrofocus design may be necessary if the reflex
mirror needs the clearance...
Eric Goldstein
--
On 7/6/08, Carlos Manuel Freaza <cmfreaza@xxxxxxxxxxxx> wrote:
> 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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