[rollei_list] Re: Biometar
- From: Marc James Small <marcsmall@xxxxxxxxxxx>
- To: rollei_list@xxxxxxxxxxxxx
- Date: Thu, 17 Apr 2008 22:39:10 -0400
At 08:55 AM 4/16/2008, Peter J Nebergall wrote:
>I have a Praktisix, 80mm 2.8 Biometar. Finally got it sorted, and the
>work I am getting is incredible. This is the first time any 6x6 I have
>is beating my Super Ikonta's 2.8 Tessar.
>
>I think someone on the list said the Biometar was a Xenotar clone? I'm
>getting results an order of magnitude up from anything previous -- and,
>recognizing there's no real future in the Praktisix, do I hunt up a
>Rollei 2.8A?
>
>What can I do to keep getting these results?
The Praktisix is unkillable: like all of the
Leica RF's to the M4-2, it is completey
mechanical and it can always be repaired by a
capable craftsman who can make broken parts: Ken
Ruth at Bald Muontain is one such.
The 2.8/80 CZJ Biometar is an outstanding lens
and is essentially identical to the 2.8/80 CZ
Planar used by Hasselblad: the design was shared
by CZJ and CZ and it was in process when Hans
Sauer left Jena for Oberkochen, and so the Courts
ruled that the design was shared, but not the
name, "Planar" passing to the West German company.
The 2.8/8cm CZJ Tessar and the 2.8/80 CZ Tessar
used on the Super Ikontas was not a really
spectacular performer: it was a front-cell
focusing design, which requires compromises in
optical quality. It was an outstanding lens and
I still use my two Prewar B's today, but for
critical work you need a 3.5/7.5cm CZJ Tessar as
used on the Rolleiflex Automat. And the 2.8/80
Biometar or Planar are another level above in
optical performance, despite being hampered by
being used on a medium-format SLR with all of the
drawbacks such a design entails.
There never was a Rolleiflex 2.8A: there was a
Rolleiflex 2.8 TLR, followed by the 2.8B und so
weiter. The Biometar used in the 2.8B is of a
different design from that used on the Praktisix,
as the 2.8/80 Planar used on the 2.8C and its
successors was of a different design from the
2.8/80 Planar used on the Hasselblad and on the Rollei MF SLR's.
Marc
msmall@xxxxxxxxxxxx
Cha robh bàs fir gun ghràs fir!
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