[rollei_list] Re: 'Old' Zeiss glass question

Thor,

Please understand, the red T does NOT indicate multi coating!

T* is the indicator of multi coating.

Richard and Marc can explain this better than grumpy old me.

Jerry

Thor Legvold wrote:

> They started multicoating before the war (around '36) but didn't
> advertise it (military secret) until 1940, IIRC. Richard would know
> exactly. Both the lenses in question are marked with the red T,
> indicating a multicoating.
>
> It will be fun trying them out, regardless.
>
> Thor
>
> On 26 Apr, 2006, at 23:17, Jeffery Smith wrote:
>
> > 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
>
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