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

• 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