Over the years I’ve seen some crazy designs patented by Canon and applications like this one are fun to read. I mean, here’s a patent application where someone was told. “Go nuts, see what you can do”. Let’s make no mistake the lenses described here would be big, heavy, and frighteningly expensive but we are here for that.
The purpose of these embodiments is to have an apodization effect (atypically a Defocus Smoothing Coating – or DS) and also have minimal vignetting.
Canon RF 70-200mm F2.0-2.8 DS
Focal length 71.79 99.55 193.18
F number 2.00 2.30 2.85
Half angle of view 16.77 12.26 6.39
Image height 21.64 21.64 21.64
total length 161.48 186.95 219.93
BF 15.67 20.48 31.62 Canon RF 28-70mm F1.6-2.0 DS
Focal length 28.91 50.03 68.11
F number 1.60 2.06 2.06
Half angle of view 36.81 23.39 17.62
Image height 21.64 21.64 21.64
Lens total length 157.90 171.01 179.46
BF 19.11 28.33 33.77Canon RF 35-70mm F1.8-2.0 DS
Focal length 35.02 50.03 68.11
F number 1.80 2.06 2.06
Half angle of view 31.71 23.39 17.62
Image height 21.64 21.64 21.64
Lens length 162.01 171.01 179.46
BF 22.26 28.33 33.77As with all patent applications these may never actually turn into actual products or even real patents. However, it’s a look into what Canon is researching for future products.
Source: Japan Patent Application 2023-170260
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