Patent: Canon 11-24mm f/4 Lens

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Egami has shown that Canon has filed a patent for an ultra-wide angle zoom:

(Translated)

Description and self-interpretation of the patent literature

Patent Publication No. 2014-10286

Publication date 2014.1.20

Filing date 2012.6.29

Example 1

Zoom ratio 2.06

Focal length f = 11.30-18.00-23.30mm

Fno. 4.10

Half angle ω = 62.42-50.24-42.88mm

Image height Y = 21.64mm

172.19-161.28-162.86mm overall length of the lens

BF 38.82-52.31-63.15mm

Canon users have been left out in this focal range for quite some time. With Nikon and their legendary 14-24mm f/2.8G ED and other third party offerings filling up the gap in the market. Can Canon produce an optically superior lens that also has such a shallow depth of field? Until they do, the only wide-angle zooms that Canon makes that come close are the 16-35 f/2.8 L II or the 8-15mm f/4L Fisheye.

[Egami]