[rollei_list] Re: 'Old' Zeiss glass question

I'm afraid you are wrong Thor, you are confusing
coating with multicoating, you are right regarding
coating but not reagarding multicoating, Zeiss T
coating was developed on 1936, Zeiss T* multicoating
was developed at the ending of sixties and at the
beginning of seventies.-

All the best
Carlos
 --- Thor Legvold <tlegvold@xxxxxxx> escribió:

> 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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