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The following patent is most likely for the EF-M range of lenses. Also appearing alongside the 16-120 IS STM in the patent is an 18-55 IS STM and an 18-200 f/3.5-6.3 IS STM.
- 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
Source: [EG]
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