Canon Patent for CN-E 18-85mm and CN-E 15.5-47mm Cine Lenses

Canon filed a new patent in Japan. The new patent describes a new CN-E 18-85mm f/2.8, CN-E 15.5-47mm f/2.8 lenses for Cinema products.

Both Canon lenses features constant F2.8 aperture throughout the zoom range. The CN-E 15.5-47 t2.8 is a compact zoom which Canon announced in 2012.

The patent for the 18-85mm seems to share the same optical formula as the already released CN-E 15.5-47mm f/2.8 lens.

Canon CN-E 18-85mm f/2.8 Cine Lens Patent

canon-patent-for-cn-e-18-85mm-and-cn-e-15-5-47mm-cine-lenses

  • Patent Publication No. 2015-4917
    • Published 2015.1.8
    • Filing date 2013.6.24
  • Example 1
    • Zoom ratio 2.80
    • Focal length 16.00 29.68 44.80
    • F number 2.80
    • Half angle (in degrees) 43.15 26.81 18.51
    • Image height 15.00
    • Overall length of the lens 263.54
    • BF 39.04
  • Example 2
    • Zoom ratio 4.50
    • Focal length 18.50 45.61 83.25
    • F number 2.80
    • Half angle (in degrees) 39.04 18.20 10.21
    • Image height 15.00
    • Lens length 263.78 263.78 263.78
    • BF 46.93 46.93 46.93
  • Canon patents
    • 5-group zoom of positive and negative negative-positive-positive
    • Inner focus (part of the first group)
    • Inner zoom