Sigma patents 500mm f/4 lens

Sigma filed a patent in Japan for a new 500mm f/4 lens. Sigma currently has a 500mm f/4.5 EX DG APO HSM model that was announced back in 2005:

Patent details:

  • Patent: 2011-70043
  • Patent filing date: Sept 28, 2009
  • Focal length: 489.9938
  • Aperture: 4.1004
  • Angle of view: 5.0498 °
  • Back Focus 90.3449mm

Source

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