Canon Patents for New EF-M Lenses (16-120, 18-55, 18-200)

Egami (translated) spotted a patent filed by Canon that appears to refer to new lenses for the EOS M system: 16-120mm f/3.5-5.6 IS STM, 18-200mm f/3.5-5.6 IS STM, and 18-55mm f/3.5-5.6 IS STM. All lenses are image stabilised and have stepping motors.

• Patent Publication No. 2013-257507
  • Publication date 2013.12.26
  • Filing date 2012.6.14
• Example 1
  • Zoom ratio 2.87
  • Focal length f = 18.58 – 27.82 – 53.36mm
  • Fno 3.60 -. 4.27 – 5.69
  • Half angle ω = 36.33 – 26.15 – 14.36 °
  • Image height Y = 13.66mm
  • 86.23 – – 104.79mm 78.22 overall length of the lens
  • BF 0.50mm
  • 13 pieces of 11-group lens configuration
  • Three four-sided aspherical
• Example 3
  • Zoom ratio 10.39
  • Focal length f = 18.60 – 60.12 – 193.23mm
  • Fno 3.55 -. 5.59 – 6.60
  • Half angle ω = 36.29 – 12.80 – 4.04 °
  • Image height Y = 13.66mm
  • 151.48 – – 184.39mm 118.58 overall length of the lens
  • BF 0.50mm
  • 18 pieces of 14-group lens configuration
  • Three three-sided aspherical
  • One UD glass
• Example 4
  • Zoom ratio 7.14
  • 51.87 – – 117.70mm 16.48 focal length
  • Fno 3.60 -. 5.30 – 5.88
  • Half angle ω = 39.65 – 14.75 – 6.62 °
  • Image height Y = 13.66mm
  • 138.55 – – 162.35mm 114.75 overall length of the lens
  • BF 0.50mm
  • 17 pieces of 13-group lens configuration
  • Two two-sided aspherical
  • One UD glass
• Canon patents
  • Vibration control
  • Inner focus