Canon’s latest patent filed in Japan is for 17-85mm F/4-5.6 lens. Canon filed a patent for 17-85mm F/4-5.6 Image Stabilized lens and when we look at the patent details, chromatic aberrations are reduced by anomalous partial dispersion, which, in turn, is obtained using synthetic resin and the inorganic oxide fine particles
Canon 17-85mm F/4-5.6 Image Stabilized Lens Patent Details
- Patent Publication No. 2013-25085
- 2013.2.4 Release Date
- Filing date 2011.7.21
- Example 1
- Zoom ratio 4.70
- 37.33 – – 82.48mm f = 17.55 focal length
- Fno 3.98 -. 5.06 – 5.64
- Half angle of view ω = 37.89 – 20.10 – 9.40 °
- Image height 13.66mm
- 134.85 – – 156.62mm 119.65 overall length of the lens
- BF 37.59 – 52.48 – 62.64mm
- 18 images in 11 groups lens configuration
- 2 UD glass sheets
- One two-sided aspherical
- 5-group zoom negative positive negative
- Inner Focus (Group 2)
via Egami (translated).
