Canon patents a 17-35 IS 4-5.6
After the release of the 24-105 3.5-5.6 STM lens, Canon's been relatively quiet on producing other STM lenses for a "cheaper" series of lenses for full frame such as what exists for crop sensor users.
This patent appears to be in line with a 17-35 4.0-5.6 IS which certainly would fit the mold of a cheaper UWA for full frame users.
Wide angle Middle Looking far
Focal distance 17.50 25.12 34.09
F number 4.00 4.85 5.88
a half field angle (degree) -- 51.03 40.73 32.40
Image height 21.64 21.64 21.64
Whole length of the lens 130.88 128.52 134.05
BF 37.60 49.75 64.06
Japan patent application 2017-161568
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