[rollei_list] Re: 'Old' Zeiss glass question... HFT and T*

I'd like to add that I obtained the  "Camera Lens News
Nº 13, Spring 2001" from the official Carl Zeiss web
site:

http://www.zeiss.com/C12567A8003B58B9/search/12617449BD5B809AC1256A1400496FD3?OpenDocument

All the best
Carlos

 --- Carlos Manuel Freaza <cmfreaza@xxxxxxxxxxxx>
escribió:

> 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!
> > > 
> > > 
> > > ---
> > > Rollei List
> > > 
> > > - Post to rollei_list@xxxxxxxxxxxxx
> > > 
> > > - Subscribe at rollei_list-request@xxxxxxxxxxxxx
> > > with 'subscribe'
> > > in the subject field OR by logging into
> > > www.freelists.org
> > > 
> > > - Unsubscribe at
> rollei_list-request@xxxxxxxxxxxxx
> > > with
> > > 'unsubscribe' in the subject field OR by logging
> > > into www.freelists.org
> > > 
> > > - Online, searchable archives are available at
> > > http://www.freelists.org/archives/rollei_list
> > > 
> > > 
> > 
> > 
> > __________________________________________________
> > Correo Yahoo!
> > Espacio para todos tus mensajes, antivirus y
> > antispam ¡gratis! 
> > ¡Abrí tu cuenta ya! - http://correo.yahoo.com.ar
> > ---
> > Rollei List
> > 
> > - Post to rollei_list@xxxxxxxxxxxxx
> > 
> > - Subscribe at rollei_list-request@xxxxxxxxxxxxx
> > with 'subscribe' 
> > in the subject field OR by logging into
> > www.freelists.org
> > 
> > - Unsubscribe at rollei_list-request@xxxxxxxxxxxxx
> > with 
> > 'unsubscribe' in the subject field OR by logging
> > into www.freelists.org
> > 
> > - Online, searchable archives are available at
> > http://www.freelists.org/archives/rollei_list
> > 
> > 
> 
> 
> __________________________________________________
> Correo Yahoo!
> Espacio para todos tus mensajes, antivirus y
> antispam ¡gratis! 
> ¡Abrí tu cuenta ya! - http://correo.yahoo.com.ar
> ---
> Rollei List
> 
> - Post to rollei_list@xxxxxxxxxxxxx
> 
> - Subscribe at rollei_list-request@xxxxxxxxxxxxx
> with 'subscribe' 
> in the subject field OR by logging into
> www.freelists.org
> 
> - Unsubscribe at rollei_list-request@xxxxxxxxxxxxx
> with 
> 'unsubscribe' in the subject field OR by logging
> into www.freelists.org
> 
> - Online, searchable archives are available at
> http://www.freelists.org/archives/rollei_list
> 
> 


__________________________________________________
Correo Yahoo!
Espacio para todos tus mensajes, antivirus y antispam ¡gratis! 
¡Abrí tu cuenta ya! - http://correo.yahoo.com.ar
---
Rollei List

- Post to rollei_list@xxxxxxxxxxxxx

- Subscribe at rollei_list-request@xxxxxxxxxxxxx with 'subscribe' 
in the subject field OR by logging into www.freelists.org

- Unsubscribe at rollei_list-request@xxxxxxxxxxxxx with 
'unsubscribe' in the subject field OR by logging into www.freelists.org

- Online, searchable archives are available at
http://www.freelists.org/archives/rollei_list

Other related posts: