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Sigma patent for 400mm f/2.8 OS Sport Lens

400

Egami (translated) spotted an interesting patent filed by Sigma. It refers to a 400mm f/2.8, image-stabilized lens. This lens will be part of Sigma’s “Sport” line-up.

  • 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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