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