[rollei_list] Re: 'Old' Zeiss glass question
- From: Carlos Manuel Freaza <cmfreaza@xxxxxxxxxxxx>
- To: rollei_list@xxxxxxxxxxxxx
- Date: Wed, 26 Apr 2006 22:20:52 +0000 (GMT)
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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