[rollei_list] Re: 'Old' Zeiss glass question
- From: Carlos Manuel Freaza <cmfreaza@xxxxxxxxxxxx>
- To: rollei_list@xxxxxxxxxxxxx
- Date: Wed, 26 Apr 2006 21:57:56 +0000 (GMT)
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.
Zeiss used a double layer, blue and gold for their
lenses on the '50s and '60s, you can distinguish both
layers clearly.
Multicoating could be an improvement for lenses with
several elements and then having internal surfaces
very much and considering certain special lighting
conditions only, i.e. wide angle lenses or zoom lenses
on backlight shots or/and with flashlight bouncing
against bright surfaces.-
All the best
Carlos
--- Jeffery Smith <jls@xxxxxxxxxx> escribió:
> No aspherical surfaces. I'm not sure when they
> started multicoating,
> but I don't think that early. Zeiss used the
> designation of *T for
> their multicoating. When they began doing it, I
> don't know. I think
> that modern CNC machining and computer designing
> gives lenses from
> the last 20 years a decided advantage over the 50's
> designs. But they
> sure were good given the tools of that era.
>
>
> At 03:57 PM 4/26/2006, you wrote:
> >Let me be more specific - the cameras I bought both
> have
> >'black-nose' Zeiss-Opton 50mm f1.5 Sonnars, both
> from the 50's
> >-60's, i.e. multicoated (T*).
> >
> >So for all practical purposes, this IS a modern
> lens, no?
> >
> >Thor
> >
> >
> >On 26 Apr, 2006, at 22:24, Jeffery Smith wrote:
> >
> >>I'm still amazed that the best overall performing
> lens in my entire
> >>collection is a 50/3.5 CV Heliar that was from a
> design waaaaay
> >>back in the early 20th century. It seems to have
> been based on an
> >>earlier design of the Tessar. Very simple, but
> very good optically.
> >>
> >>Jeffery
> >>
> >>At 03:14 PM 4/26/2006, Richard wrote:
> >>> As far as design goes, my designer friend,
> Brian Caldwell,
> >>> tells me that many of the older Zeiss designs
> are about as good
> >>> as they can get. Setting these up in a lens
> optimization program
> >>> demonstrates that even changes in glass types
> will not much
> >>> improve them. Old Tessars and Protars fall into
> this category.
> >>> This is not to say that they are wonderful
> lenses, only that
> >>> Zeiss pretty well exhausted the capabilities
> early on.
> >
> >---
> >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
> >//www.freelists.org/archives/rollei_list
> >
> >
>
>
> ---
> 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
> //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
//www.freelists.org/archives/rollei_list
Other related posts: