Patent Application for Canon RF 16-28mm F2.8, 16-28mm F2.8-4 and 16-28mm F4 designs
This patent application is interesting from the curiosity standpoint but with Canon already creating both F2.8 and F4 ultra wide angle lenses not to mention a consumer STM I can't really see a place in Canon's current lineup for this lens.
As with all patent applications, it may never make it into production, but it's an indicator on what Canon was looking at doing. I suspect that this design and the 14-35mm were competing designs.
Also, the back focus on these designs is arguably a little tight - but still doable. The image quality at 16mm will also suffer from having to be digitally stretched to fit the full frame image circle. Of course if Canon could make these cheap enough, they would also make a pretty good APS-C kit lens.
Canon RF 16-28mm F2.8
Focal length 16.45 21.00 27.50
F-number 2.88 2.88 2.88
Half angle of view 52.70 47.08 39.08
Real image height 19.00 21.00 21.64
Total length 138.01 130.43 127.00
Back focus 14.00 14.00 14.00
Canon RF 16-28mm F2.8-4
Focal length 16.45 21.00 27.50
F number 2.88 3.50 4.00
Half angle of view 52.70 46.87 38.91
Actual image height 19.00 21.00 21.64
Total length 121.56 117.78 117.78
Back focus 14.51 14.21 14.50
Canon RF 16-28mm F4
Focal length 16.45 21.00 27.50
F number 4.10 4.10 4.10
Half angle of view 52.69 47.04 39.09
Real image height 19.00 21.00 21.64
Total length 124.60 121.27 121.49
Back focus 14.08 14.08 14.08
Canon Patent Application 2022-112179
11529
Richard CanonNews
Richard has been using Canon cameras since the 1990s, with his first being the now legendary EOS-3. Since then, Richard has continued to use Canon cameras and now focuses mostly on infrared photography. Richard is the founder and editor of CanonNews since 2017, and has worked as a writer on CanonRumors and other websites in the past.
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