New Canon Cine Lens Patents: CN-E 18-85mm f/2.8, CN-E 15.5-47mm f/2.8

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Canon filed two new Cinema zoom lens patents in Japan: Canon CN-E 18-85mm f/2.8 Lens and Canon CN-E 15.5-47mm f/2.8 Lens. Both the canon lenses features constant F2.8 aperture throughout the zoom range.

Take a look at the patent details below translated by google

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

via: EG

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