According to the Egami Blog, Canon has filed a patent for a 16-40mm f/4 lens design.
Might the EF 17-40mm f/4L USM‘s successor be in the works with an even wider focal length? Only time will tell.
From the Egami Blog (Google translated):
Description of the patent literature
Patent Publication No. 2015-206976
- Published 2015.11.19
- Filing date 2014.4.23
Example
- Zoom ratio 2.36
- Focal length 16.48 24.40 38.90
- F-number 4.12 4.12 4.12
- Half angle (in degrees) 52.70 41.56 29.08
- Image height 21.64
- Overall length of the lens 177.74 162.40 159.73
- BF 38.00 45.51 63.40
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