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We're likely going to see a flurry of RF mount lens patents over the next few years. EF lens development generally builds off previous designs, RF lens development, for the most part, is going to be all new. I think we're likely to see some crazy and cool concepts over the next few years from Canon.
This patent application is for a different 28-70mm, which doesn't resemble the RF 28-70mm f/2L USM at all. This patent shows a 28-70mm lens that is much smaller at 155mm compared to the RF 28-70mm f/2L USM at just shy of 200mm.
Japan Patent Application 2018-197774:
Focal distance 28.84 44.14 67.90
F number 2.25 2.62 2.91
a half field angle 36.88 26.11 17.67
Image height 21.64 21.64 21.64
length of the lens 146.94 157.60 175.00
BF 20.75 28.77 34.64
Focal distance 28.82 44.24 67.90
F number 2.27 2.63 2.91
a half field angle 36.90 26.06 17.67
Image height 21.64 21.64 21.64
length of the lens 150.08 159.44 174.76
BF 20.56 29.08 35.42
We don't expect this optical formula to make its way into the RF lens lineup, as we think the RF 24-70 f/2.8L IS (or similar) that's coming in 2019 will fit the smaller and more accessible spot in the lineup over a variable aperture overlap of a current lens.
