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Canon Patent For 180mm f/3.5 DO Macro Lens

The EF 180mm f/3.5L Macro

Egami (translated) spotted a new patent filed by Canon for a 180mm f/3.5 diffractive optic macro lens.

  • Patent Publication No. 2014-137484
    • Published Date 2014.7.28
    • Filing date 2013.1.17
  • Example 1
    • Focal length f = 180.00mm
    • Shooting magnification ∞ 0.5x 1.0x
    • Fno. 3.50-4.50-5.20
    • Half angle ω = 6.85 °
    • Image height 21.64mm
    • The overall length of the lens 202.38mm
    • BF 52.18mm
    • Effective diameter of the front lens 58.18mm
    • 12 sheets 8 groups lens configuration
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