[LargeFormat] Roman numerals on Zeiss barrel lenses
Les Newcomer
largeformat@f32.net
Wed Jun 25 12:44:00 2003
On Tuesday, June 24, 2003, at 11:42 PM, Stuart Phillips wrote:
> 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
> He's already blown the bail hearing.
YIKES! I've read what links came through. What a mess!
>
>
>>>
>>> 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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