Biogon (French Wikipedia)

Analysis of information sources in references of the Wikipedia article "Biogon" in French language version.

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archive.org (Global: 6th place; French: 63rd place)

  • Rudolf Kingslake, A history of the photographic lens, Boston : Academic Press, , 354 p. (ISBN 978-0-12-408640-1, lire en ligne), « "8. Meniscus Anastigmats" », p. 117
  • Rudolf Kingslake, A History of the Photographic Lens, San Diego, Academic Press, 354 p. (ISBN 0-12-408640-3, lire en ligne), « 6. The First Anastigmats », p. 81-102
  • Rudolf Kingslake, A History of the Photographic Lens, San Diego, Academic Press, , 354 p. (ISBN 0-12-408640-3, lire en ligne), « 4. Early Double Objectives », p. 49-68
  • Rudolf Kingslake, A History of the Photographic Lens, San Diego, Academic Press, , 354 p. (ISBN 0-12-408640-3, lire en ligne), « 10. Reversed Telephoto Lenses », p. 141-152

casualphotophile.com (Global: low place; French: low place)

espacenet.com (Global: 800th place; French: 1,489th place)

worldwide.espacenet.com

  • US Patent 2549159A, Ludwig Bertele, "Highly corrected photographic objective having four axially air spaced components", published April 17, 1951, assigned to Wild Heerbrugg AG 
  • [1], issued October 11, 1932 
  • [2], issued February 25, 1936 
  • [3], issued 14 February 1956 
  • US patent 2730016A, Ludwig Bertele, "Photographic wide-angle objective", issued January 10, 1956, assigned to Bertele, Ludwig 
  • US patent 2781695, Gunter Klemt, "Optical system with large effective image angle", issued February 19, 1957, assigned to Jos. Schneider & Co. 
  • US patent 2897725, Günter Klemt & Karl Heinrich Macher, "Optical system with large effective image angle", published August 4, 1959, assigned to Jos. Schneider & Co. 
  • [5], "Improvements in wide angle objectives", published July 6, 1955 
  • [6], "Dreilinsiges Weitwinkelobjektiv [Three-element wide-angle lens]", published June 1, 1967 

graflex.org (Global: low place; French: low place)

lallement.com (Global: low place; French: low place)

  • « Fujica G690 Lenses », The 6x9 Photography Online Resource (consulté le )

lens-db.com (Global: low place; French: low place)

mr-alvandi.com (Global: low place; French: low place)

nikon.com (Global: low place; French: low place)

imaging.nikon.com

pacificrimcamera.com (Global: low place; French: low place)

  • « SCHNEIDER lenses », Pacific Rim Camera, Reference Library, Burleigh Brooks Inc., (consulté le )
  • « Leitz Photographic Equipment », Pacific Rim Camera, Reference Library, E. Leitz Inc., (consulté le )
  • « View Camera Lenses », Pacific Rim Camera, Reference Library, Rodenstock Optical Works (consulté le )
  • « Fujinon Professional Lenses », Pacific Rim Camera, Reference Library, Fujifilm, (consulté le )

patents.google.com (Global: 1,182nd place; French: 2,617th place)

  • US patent 2084309, Bertele, Ludwig, "Photographic lens system", issued 22 June 1937, assigned to Zeiss Ikon AG 
  • Bertele Ludwig, Five component wide-angle objective, (lire en ligne)
  • [4], "Five component wide-angle objective", issued 25 October 1955 

subclub.org (Global: low place; French: low place)