[rollei_list] Re: 'Old' Zeiss glass question... HFT and T*
- From: Carlos Manuel Freaza <cmfreaza@xxxxxxxxxxxx>
- To: rollei_list@xxxxxxxxxxxxx
- Date: Wed, 26 Apr 2006 23:02:35 +0000 (GMT)
I have some sources about Rollei HFT and Zeiss T*, one
of them is "Camera Lens News Nº 13, Spring 2001":
"How do Zeiss T* and Rollei HFT compare?
Since this has recently grown into a frequently asked
question we feel it is appropriate to provide an
official and unequivocal answer from Carl Zeiss:
HFT, meaning "High Fidelity Transfer", is a
multi-layer anti-reflection coating system
co-developed by Zeiss and Rollei. This occurred
several decades ago at a time when Zeiss T* coating
was new on the market and could only be applied at the
Zeiss Oberkochen plant to rather small camera lens
production batches. Rollei envisaged very large volume
production in their then new Singapore plant and
therefore encouraged this joint development.
Today the situation is this: HFT has become a well
established trademark for Rollei's proprietary
multi-layer anti-reflection coating. The optical
performance of this Zeiss/Rollei co-development is so
close to the performance of the original Zeiss T* that
one can hardly detect any difference in all practical
picture taking.
The Planar®, Distagon®, Sonnar® lenses that Rollei
produces under license from Carl Zeiss are all HFT
coated by Rollei. All the lenses that Carl Zeiss
produces for Rollei at the Zeiss Oberkochen plant are
actually Zeiss T*. coated. However, the designation on
these lenses is "HFT" in the interest of remaining
fully consistent throughout the Rollei product range.
Camera Lens News No. 13, Spring 2001"
All the best
Carlos
--- Carlos Manuel Freaza <cmfreaza@xxxxxxxxxxxx>
escribió:
> Marc, are the lenses that Rollei manufactured and
> manufacture under Zeiss license the same regarding
> design however different regarding multicoating?,Do
> we
> assume that the same lens could have a different
> performance under certain conditions?
>
> All the best
> Carlos
>
>
> --- Marc James Small <msmall@xxxxxxxxxxxx>
> escribió:
>
> > At 09:57 PM 4/26/06 +0000, Carlos Manuel Freaza
> > wrote:
> > >Rollei and Zeiss developed together the same
> > >multicoating process starting the seventies
> ('70s),
> > >Rollei called it "HFT" and Zeiss T*, it happened
> > when
> > >Rollei bought the Voigtländer Optical Works in
> > >Braunschweig.
> >
> >
> > Rollei has always claimed that the HFT process is
> > different from the Zeiss
> > "T*" multi-coating, but the truth is more prosaic.
>
> > "T*" was developed as a
> > joint project by Carl Zeiss and Asahi and it was
> > shared between these two
> > firms. When Rollei purchased Voightländer out of
> > the wreck of Zeiss Ikon,
> > they got the right to share the process but were
> > denied the use of the "T*"
> > trademark, so they came up with HFT as a
> substitute.
> > Rollei does their own
> > coating and has done so for decades but they use
> the
> > Zeiss process, though
> > they modify the chemical composition as they see
> > fit, meaning that a given
> > lens made in Oberkochen in one mount or in Kyocera
> > in Contax RTS mount or
> > in Braunschweig will be identical in design but
> may
> > have differently shaded
> > coatings.
> >
> > Marc
> >
> > msmall@xxxxxxxxxxxx
> > Cha robh bàs fir gun ghràs fir!
> >
> >
> > ---
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> >
> >
>
>
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