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A couple of optical formula consumer zoom lens patents have appeared at the USPTO.
Canon EF 17-70mm f/3.5-5.6 (US Patent Application 20180275370)
Focal Length 17.40 35.00 67.98
F-Number 3.23 4.10 5.85
Image Height 21.64 21.64 21.64
BF 38.38 53.37 84.83
Canon EF 16-60mm f/3.5-6.3 (US Patent Application 20180275382)
Focal Length 16.30 24.10 58.00
F-Number 3.59 3.94 6.37
Image Height 21.64 21.64 21.64
BF 38.42 45.65 83.75
Canon EF-M 15-45mm f/3.5-6.3 (US Patent Application 20180275383)
Focal Length 15.45 30.00 44.45
F-Number 3.60 5.00 6.44
Image Height 13.66 13.66 13.66
BF 11.36 11.36 11.36
The EF-M 15-45mm f/3.5-6.3 IS STM is one of the few weak spots in the EF-M lens lineup and an update would be quite welcomed.
