Patent: Canon RF kit zoom lenses

Richard Cox
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CanonNews discovered another patent detailing some interesting kit zooms that start off at the ultra wide-angle.  It's unknown if Canon would ever make such a lens, but the zoom range is very intriguing.

It's also a lens that could double for a standard lens for APS-C.  However, it would bigger than it would need to be since it's designed to cover the full frame image circle.

This is the second patent found with these lenses, indicating to me at least, that there is active interest inside of Canon for this type of lens.

Canon RF 17-70 F3.5-F5.6

focal length        17.40  35.02  68.69
F-number             3.57   4.18   5.85
half-field angle    51.19  31.71  17.48
Image height        21.64  21.64  21.64
total lens length  149.59 133.68 150.50
BF                  13.43  27.63  57.99

Canon RF 18-80 F3.5-F5.6

focal length        18.70  37.55  77.50
F-number             3.57   4.18   5.85
half-field angle    49.16  29.95  15.60
Image height        21.64  21.64  21.64
total lens length  146.50 128.90 147.50
BF                  15.19  27.72  59.84
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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 the genre of infrared photography.
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