Canon Patent Application: High Magnification Super Telephoto Zooms

Atypically in patent embodiments, it's usually difficult for super telephoto zoom lens to take full advantage of the RF mount.  One reason is that you simply can't use a Tele extender if the rear elements are sitting too far back in the lens.  Because of this, at times, it's difficult to determine if a patent application is for RF or EF lenses because there's so much room in the rear of the lens from the last element to the sensor plane, that it could be either mount.

These embodiments however show a back focus distance of around 30mm, which would make them more non extender friendly lenses or they could also fit the extender on for only the telephoto part of their zoom, similar to the RF 100-500L.  With a short back focus distance, these embodiments are certainly RF mount only.

Canon RF 60-600mm F4.5-8
Focal length            61.50 164.60 585.00
F number                 4.46   5.94   8.16
Half angle of view (°)  19.38   7.49   2.12
Lens total length      258.90 302.70 346.50
BF                      30.00  49.79  90.50

Canon RF 70-700mm F4.5-F8
Focal length            70.00 185.35 682.00
F number                 4.76   6.20   8.16
Half angle of view (°)  17.18   6.66   1.82
Lens total length      271.00 316.00 361.00
BF                      31.22  50.94  97.50

Japan Patent Application 2022-053697

Richard CanonNewsRichard 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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