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Canon Patent for 12-32mm T3.5 and a 15-47mm T2.8 Cinema Lenses

pat

Egami (translated) spotted a patent for two Cinema lenses, a 12-32mm T3.5 and a 15-47mm T2.8 lens.

  • Patent Publication No. 2015-34858
    • Published 2015.2.19
    • Filing date 2013.8.8
  • Example 1
    • Zoom ratio 2.50
    • The focal length f = 12.50 18.75 31.25mm
    • Fno. 3.50
    • Half angle ω = 51.21 39.67 26.45 °
    • Image height Y = 15.5mm
    • Overall length of the lens 193.59
    • BF 42.84
  • Example 2
    • Zoom ratio 2.81
    • Focal length 16.00 26.88 45.00
    • Fno. 2.80
    • Half angle of 44.18 30.05 19.06
    • Image height Y = 15.5mm
    • Overall length of the lens 247.38
    • BF 43.27
  • Canon patent
    • Negative positive and negative positive 4-group zoom
    • Inner zoom (the second group)
    • Inner focus (rear group of the first group)
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