[rollei_list] Re: 'Old' Zeiss glass question

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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