The Zeiss Protar
Original Zeiss documentation
- Some sets
- German patents
- US patents
- Stops tables
Original Zeiss documentation (1901)
- p17 Abstufung der Blenden-Oeffnungen der mit Iris versehenen Fassungen nach Millimetern des Durchmessers.
- p18 Die relative Oeffnung einer Objectiv-Blende. Blendensystem der Royal Photogr. Society of Great Britain (U.S. Nos).
- p30 Die Protare, unsymmetrische Doublets.
- p31 Protarlinsen und Doppel-Protare.
- p32 Serie VII
- p59 Serie V. Protar 1:18.
- p60 Protar 1:18
- p65 Serie VII Protarlinse
- p66 Protarlinse in Normalfassung mit Irisblende.
- p69 Serie VIIa. Dopper-Protar.
- p70 Das Doppel-Protar in Mormalfassung mit Irisblende.
- p76 Protar-Sätze.
- p77 Protar-Satz C, Protar-Satz D
- p80 Tabellen der Blenden und Brennweiten für Protar-Sätze.
Some examples of protar set.
- Der Protar-Satz D
- Zeiss Protar IV VII set 48 48 41 35 29 Coumpound casket
- Zeiss Protar set 41 35 29 24 Compound casket
- Zeiss Anastigmat set 530 450 385 320 barrel casket
- Zeiss Protar set 35 35 29 Compur
- Zeiss Protar set 35 22 Compur casket
The german patent
Protar (asymetric doublets)
Carl Zeiss, Optische Werkstaette Jena: Deutsche Patentschrift 56109
v. 3 April 1890, granted 20. Mai 1891.
The real inventor is Dr. P. Rudolph (1889)
A patent for the serie VI was granted in 1893.
To be able to follow the demand they were produced under a Zeiss License
in the US, UK, France (Krauss) and Italy (Koritska).
Double Protar Serie VII (anastigmat) Dr. P. Rudolph (1894).
The first double protar are available on the market in Q2 1895.
Dr. P. Rudolph: English patent v.17. Nov. 1894 No. 19509.
British journal of Photography 1894, 28 VII. pag. 829.
The United States patent 532,398 dated January 8, 1895.
Please refer to the U.S. patent and Trade-Mark Office site at "http://www.uspto.gov".
The United States patent 1,021,337 dated March 26, 1912.
Aperture table
This table is the table I use, taken from the above documentation.
Download a text version of this table mytable.txt
| Serie,Number | Front-Back | given f | real f | 45 | 32 | 22.6 | 18 | 16 | 12.5 | 11.3 | 8 | 7.2 |
| | Protar 1:18 | 180 | 169 | 3.5 | 5.5 | 7.5 | 9.5 | | | | | |
| VII,8 | 35-29 | 179 | 160 | 3.5 | 5 | 7 | | 10 | | 14 | 20 | 22 |
| VII,9 | 41-29 | 192 | 171 | 3.5 | 5.5 | 7.5 | | 11 | | 15 | 21 | |
| VII,11 | 41-35 | 216 | 191 | 4 | 6 | 8.5 | | 12 | | 17 | 24 | 27 |
| VII,12 | 48-35 | 232 | 204 | 4.5 | 6.5 | 9 | | 13 | | 18 | 25 | |
| VII,14 | 48-41 | 254 | 222 | 5 | 7 | 10 | | 14 | | 20 | 28 | 31 |
| VII,3 | -29 | 285 | 291 | 6.5 | 9 | 13 | | 18 | 23 | | | |
| VII,4 | -35 | 350 | 354 | 8 | 11 | 16 | | 22 | 28 | | | |
| VII,5 | -41 | 412 | 413 | 9 | 13 | 18 | | 26 | 28 | | | |
| VII,6 | -48 | 480 | 482 | 11 | 15 | 21 | | 30 | 33 | | | |
Download a text version of the focal length for some lens combinations.
