Canon Patents

Patent: CN-E 20-100 T2.8 & CN-E 20-120 T2.8-T3.5

Here we have another patent for more cine lens optical formulas. This time for two lenses, a CN-E 20-100 T2.8 and a CN-E 20-120 T2.8-T3.5.

I’m starting to think we’re going to see some new cinema lenses this fall once the EOS C300 Mark II begins shipping.

Patent Publication No. 2015-18083 (Google Translated)

  • Published 2015.1.29
  • Filing date 2013.7.10

Example 1

  • Zoom ratio 6.00
  • Focal length 21.00 87.93 125.94
  • F number 2.77 2.77 3.66
  • Half angle of 35.54 9.68 6.79
  • Image height 15.00
  • Overall length of the lens 314.76
  • BF 50.03
  • Example 2

Zoom ratio 5.00

  • Focal length 20.00 69.46 100.00
  • F number 2.76 2.77 2.77
  • Half angle of 36.50 12.03 8.42
  • Image height 14.80
  • Overall length of the lens 294.44
  • BF 50.07

Canon patents

  • Positive and negative positive and negative positive five-group zoom
  • Inner focus (part of the first group)
  • Inner zoom

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