[rollei_list] Re: 2.8F opton?
- From: "Eric Goldstein" <egoldste@xxxxxxxxx>
- To: rollei_list@xxxxxxxxxxxxx
- Date: Mon, 7 Jul 2008 13:49:25 -0400
Hi Peter -
From what I understand, Carlos is saying the Biometar on the Praktica
and the 2.8 B is the same formula/type, similar to the Xenotar. I am
questioning how that is possible, given that the Praktica is an SLR
and would need a design with enough back focus to clear the mirror,
which to my knowledge the Xenotar (and 5 element Planar) do not have.
If they did, you'd see them elsewhere on other SLRs, like the
Hasselblad...
So we have an open question without a definitive answer...
Eric Goldstein
--
On 7/7/08, Peter J Nebergall <iusar4s@xxxxxxxx> wrote:
> so the 2.8 Biometar on my Praktisix is a different formula?
>
> p.j.nebergall
> On Sun, 6 Jul 2008 21:40:28 -0400 "Eric Goldstein" <egoldste@xxxxxxxxx>
> writes:
>
> > 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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