Mirrorless 9-18mm UWA lens patent

It's hard to imagine Canon replacing the excellent 11-22mm however one common complaint is that it's not wide enough.

The 11-22 *is* a mere 18-35 in full frame equivalence, so some improvement could be made - only if it's optically as excellent as the 11-22.

Here we have a 9-18 4-5.6 mirrorless lens patent application.  The primary goal was to make the focus group as small as possible to allow for faster AF on mirrorless contrast detection styled camera systems .. aka Mirrorless and also video.

Zoom ratio   1.91 
                          Wide angle  Middle  Looking far 
Focal distance            9.27        13.35   17.70 
F number                  4.12         4.84    5.57
Field angle              55.84        45.67   37.66 
Image height             13.66        13.66   13.66 
Whole length of the lens 61.48        56.10   54.43 
BF                       10.29        13.62   16.52 

Note that this lens doesn't have IS.  Which is a notable omission.  It could very well be that this is a defensive patent, and one that won't see the light of day.  However, as a self-proclaimed UWA bigot, I'd love to have a wider lens than the 11-22.

Japan Patent Application 2017-219644

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