Zeiss Biogon

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Biogon
Bertele-Zeiss Biogon (1951, f4.5).svg
Introduced in1951
AuthorLudwig Bertele
Construction8 elements in 5 groups
Aperture4.5

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.

History[edit]

Bertele's Biogon (1934, US 2,084,309)[1]

The first lens branded Biogon (2.8 / 3.5 cm, unbalanced) was designed in 1934 by Ludwig Bertele,[1] then assigned to Zeiss Ikon Dresden, the Contax created as a modification of the then Sonnar. It was developed by Carl Zeiss in approximately 1937 and manufactured in Jena, then a redesign in Oberkochen.

In 1951, a new Biogon with a 90° angle of view (Super Wide Angle) was designed, also by Ludwig Bertele.[2] The advent of the Biogon opened the way to extreme wide-angle lenses. The first examples 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 the 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.[2]

Examples[edit]

Leica CL with Carl Zeiss Biogon 2,8 / 28 mm lens
Zeiss Biogon 2,8 / 21 mm lens

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.

The lenses branded Super-Angulon (sold by Schneider Kreuznach and Leica Camera) are based on the construction of the Biogon.

Other Zeiss lenses include the Triotar, Biotar, Biometar, Tessar, Planar, Sonnar, Distagon [de], Flektogon [de], Hologon, Topogon, Kipronar, Prokinar.

See also[edit]

References[edit]

  1. ^ a b US Grant 2084309, Bertele, Ludwig, "Photographic lens system", issued 22 June 1937, assigned to Zeiss Ikon AG 
  2. ^ a b US Grant 2721499, Bertele, Ludwig, "Five component wide-angle objective", issued 25 October 1955, assigned to Bertele, Ludwig 

Bibliography[edit]

  • Nasse, H. Hubert (December 2011). "From the series of articles on lens names: Distagon, Biogon and Hologon" (PDF). Camera Lens Blog (CLB) (41st ed.). Carl Zeiss AG, Camera Lens Division. Retrieved 2013-06-08. (NB. German: [1])

External links[edit]