Egami, the Photography Blog in Japan spotted another new Canon patent. It is 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. You can read the article here on the magazine's blog.
Patent Publication No. 2013-25085
Release date - February 4, 2013
Filing date - July 21, 2011
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)
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