Sigma 400mm f/2.8 DG OS HSM Sports Lens Patent

Sigma has filed a new super telephoto prime lens in Japan: Sigma 400mm f/2.8 DG OS HSM Sports Lens. It is designed for DSLR cameras with full-frame image sensors and it will be much cheaper than Canon and Nikon version.

• Patent Publication No. 2015-64436
  • Published 2015.4.9
  • Filing date 2013.9.4
• Example 1
  • Focal length 390.00mm
  • Fno. 2.91
  • Total angle of view 2ω 6.29 °
  • Image height Y 21.63mm
  • Overall length of the lens 353.00mm
  • Positive, positive positive and negative negative 5-group configuration
  • Inner Focus (fourth group)
  • Anti-vibration (part of the fifth group)

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via: eg