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| Introduced in | 1934, 1951 |
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| Author | Ludwig Bertele |
| Construction | 8 elements in 5 groups |
| Aperture | 4.5 |
Biogon is the brand name of Carl Zeiss for a series of photographic camera lenses, first introduced in 1934. Biogons are typically wide-angle lenses.
| | |
| Introduced in | 1934, 1951 |
|---|---|
| Author | Ludwig Bertele |
| Construction | 8 elements in 5 groups |
| Aperture | 4.5 |
Biogon is the brand name of Carl Zeiss for a series of photographic camera lenses, first introduced in 1934. Biogons are typically wide-angle lenses.
The first Biogon lens (2.8 / 3.5 cm, an asymmetric design featuring seven elements in four groups) was designed in 1934 by Ludwig Bertele [1] while he was working for Zeiss, as a modification of his earlier Sonnar design (1929). [3] : 120 The Biogon was assigned to Zeiss Ikon Dresden and marketed with the Contax rangefinder camera. It was produced by Carl Zeiss starting in approximately 1937, first in Jena, then a redesigned version was built in Oberkochen.
Bertele would go on to reuse the design for the Wild Aviotar. [3] : 120 After World War II, KMZ also reused the Biogon design for the Jupiter-12. [4]
Symmetric wide-angle lenses with meniscus elements facing the object and image had been developed in the 1930s, including the Schneider Kreuznach Angulon (Tronnier, 1930) with two outer negative menisci, [5] derived from the Goerz Dagor (Emil von Höegh, 1892); [10] : 92 and the Zeiss Topogon (Richter, 1933) with two outer positive menisci, [6] derived from the Goerz Hypergon (1900). [11] : 54–55 [3] : 118–119 These concepts were combined in a symmetric super-wide angle lens design using mirrored inverted telephoto lenses, as patented by Roosinov in 1946. [12] : 150
In 1950, Bertele designed the Wild Aviogon as a similar highly-symmetric wide-angle lens with a large angular coverage. [8] The following year, in 1951, Bertele designed a new Biogon with a 90° angle of view (Super Wide Angle). [9] The Biogon has been characterized as a simpler Aviogon. [12] : 151 Compared to the Aviogon, the Biogon removed a meniscus element and simplified the group ahead of the aperture. [9]
The first regular production Biogon lenses were produced from 1954 as the 4.5 / 21 mm for Contax, in 1954, 4.5 / 38 mm for Hasselblad Super Wide, and from 1955 to 1956 as the 4.5 / 53 mm and 4.5 / 75 mm for Linhof. The original patent spanned three different variants, each with a different maximum aperture: f/6.3, f/4.5, and f/3.4 lenses. [9]
The advent of the Biogon opened the way to more extreme wide-angle lenses. Bertele continued to develop his design, patenting an asymmetric wide-angle lens in 1952 that covered an astonishing 120° angle of view "and beyond, practically distortion free", by adding a strong negative meniscus front element to the Biogon design, showing influences from earlier fisheye lens designs, including the AEG Weitwinkelobjektiv (1932) and Zeiss Sphaerogon (1935, Willy Merté ), and the Angénieux retrofocus (1950). [13]
Since their introduction, lenses branded Biogon are usually approximately symmetrical ("semi-symmetrical") wide-angle design with a usable angle of view of 90° or more. At 90° the focal length is approximately half as long as the format's diagonal.
Well known camera manufacturers like Hasselblad have or had Biogon derived lenses to offer.
Several companies developed and sold highly symmetric super-wide angle lenses similar to the Biogon, including:
Günter Klemt patented the Super-Angulon for Schneider in 1954, citing Roosinov's 1946 patent; neither the Wild or Zeiss patents by Bertele were cited; [14] The Super Angulon design shares the same six-element, four-group construction with inner cemented doublets flanked by large negative meniscus elements with the Roosinov patent, diverging significantly from Bertele's Aviogon/Biogon designs. The Super-Angulon bears more similarities to the prior Angulon, designed by Albrecht Tronnier for Schneider in 1930 as another highly symmetric wide-angle lens with two cemented triplets. [5] A later 1957 patent by Klemt in collaboration with Karl Heinrich Macher, refining the Super Angulon design for Schneider, added citations to Bertele's patents. [31]
Wild continued to refine the Aviogon and filed for a patent on a simplified design in 1952; [32] that patent, in turn, was cited by Drs. Erhard Glatzel and Hans Schulz in their 1966 patent for the Hologon . [33]
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