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http://www.canonrumors.com/patent-canon-ef-17-35mm-f-4-5-6-is-stm/
Patent: Canon EF 17-35mm f/4-5.6 IS STM
We¡¯ve heard some chatter that Canon would continue to develop it¡¯s non-L zoom lenses for full frame camera lineup and this patent for an EF 17-35mm f/4-5.6 IS would seem to fit into that segment.
Canon News, a new leader in patent tracking found this one.
Canon EF 17-35mm f/4-5.6 IS STM Optical Formula
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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