[LargeFormat] Roman numerals on Zeiss barrel lenses

[Stuart Phillips]

Marc James Small may know something about Zeiss lenses but as he's busy
defending Bob Shell in Virginia on what may be a murder charge;  I'd
hesitate to bother him. He's already blown the bail hearing.


>>
> > http://home.twmi.rr.com/lnphoto/zeissbarrel.jpg
> >
> > The above link shows two  Zeiss lenses,  the top is a 25cm
> Tessar with
> > the Roman numeral "X" and in subscript "2"
> >
> > The lower lens is a Protar VIIa  with the roman numeral
> "IV" and in
> > subscript  "1"
> >
> > The owner of the Tessar also owns  two other lenses all
> marked "Ic"  so
> > I assume they are Tessars.
> >
> > He has an 18cm  marked  BVI  (sub 2)   and  a 21 Marked
> VII (no sub)
> >
> > Any ideas what these alien markings mean?
> >
> > the only pattern I see is that the roman numerals increase
> in size as
> > the barrel dia increases.
> >
> > My Protar, at f7.7 is the smalles and is marked #4
> > The 18cm  f4.5 is marked #6  with an odd B in there
> > The 21 cm  also 4.5 has to be larger than the 180 and is
> marked VII
> > and the 25cm is marked "10"
> >
> > Not sure if there really were three different sizes of
> barrels between
> > a 210 and a 250mm, but it's a theory.
> >
>
>   I don't know what the X2 means.
>   1c is a series number both Zeiss and Bausch & Lomb made
> Tessars with series numbers. Series 1c is the f/4.5 version;
> Series 2b is the f/6.3 version.
>   Protar lenses came in several series.
> Series I  = f/4.5, original design
> Series II = f/6.3  "
> Series III= f/7.2
> Series IIIa = f/9
> Series IV = f/12.5 medium wide angle
> Series V = f/18 extreme wide angle
> Series VII = f/12.5 Single cells of convertible Protars
> Series VIIa = f/6.3, f/7, f/7.7 Combined convertible
> Protars.
>   Protars and Tessars also had catalogue numbers. Some
> lenses show these and some don't. They are NOT the numbers
> on the sides of the barrel.
>   I have a feeling these were added by some owner and not
> Zeiss.
>   FWIW the No.4 Series VII Protar is 35cm or 14 inches FL.
> Some of these numbers have an a or b subscript. The numbers
> for the Series 1c and 2b Tessars do not overlap. Series 1c
> (f/4.5) run from No.10, at 4cm to No.20 at 50cm (must be
> huge).
>   The 2b (f/6.3) runs from No.0 at 4cm to No.11 at 60cm.
>   This is all from a 1926 catalogue and 1928 price list.
> There may have been other numbers or series at other times.
> In general, B&L follows approximately Zeiss practice but the
> focal lengths of the various lenses are somewhat different.
>
> ---
> Richard Knoppow
> Los Angeles, CA, USA
> dickburk@ix.netcom.com
>
>   I don't have a listing for the Series VI but I think it
> may have been the "Triple Protar" a Dagor type but with
> reversed order of powers of the cemented elements.
>   Paul Rudolf was working on this design at the time the
> Dagor was patented by von Hoegh. I suspect this is why Zeiss
> refused to hire von Hoegh when he applied there before going
> to Goerz.
>
>
>
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