Canon Files Patent For 17-85mm F/4-5.6 Image Stabilized Lens

New Canon patent spotted by Egami (translated). This time the patent is about a 17-85mm f/4-5.6 lens with image stabilization. According to the patent, chromatic aberrations are reduced by anomalous partial dispersion, which, in turn, is obtained using synthetic resin and the inorganic oxide fine particles.

• 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]