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Canon Patent Application: Canon RF Super Zooms
Canon Patent Application: Canon RF Super Zooms
MirrorlessReports Admin

Canon Patent Application: Canon RF Super Zooms

Canon has applied for a patent on a various selection of superzooms for the RF mount.

This first one doesn't really quality for a super zoom, it's left a little wanting, but it's still better than 24-104 that we usually see.  This would still be very consumerish even with a constant aperture, with the bolded image circle happening at 28mm.  This means that the image has to be stretched at 28mm to fill the entire full frame.  We'll see this alot in the coming lens examples

Focal length 28.84 80.09 135.75
F-number 4.12 4.12 4.12
Half angle of view (deg) 33.13 15.12 9.06
Image height 18.82 21.64 21.64
Total lens length 167.97 167.97 167.97 
BF 27.78 27.78 27.78

Now we get into what I would call a super zoom, with a zoom ratio of 6.73x, and still with a constant aperture.

Focal length 24.72 99.78 166.47
F-number 4.12 4.12 4.12
Half angle of view (deg) 37.29 12.23 7.40
Image height 18.82 21.64 21.64
Total lens length 236.70 236.70 236.70 
BF 23.98 23.98 23.98

This next one is most likely for the EF-S mount since the backfocus distance is around 40mm (the EF mount is around 44mm, and EF-S can be a little closer to the sensor than 44mm).  Interestingly, is the image height. Usually, from Canon that is 13.66, and again we see stretching at the wide end.

Focal length 17.51 83.09 169.77
F-number 3.61 3.60 3.61
Half angle of view (deg) 36.33 10.10 4.98
Image height 12.88 14.80 14.80
Total lens length 248.91 248.91 248.91 
BF 40.40 40.40 40.40

Remember when I said there were some neat super zooms in this list? Well, here's one.  A F2.8 super zoom. Made not for the EF mount, and is full frame.  It's not small at nearly 31cm in length, but still. 28-280cm F2.8

Focal length 27.81 146.83 269.60
F-number 2.88 2.88 2.88
Half angle of view (deg) 34.09 8.38 4.59
Image height 18.82 21.64 21.64
Total lens length 340.47 340.47 340.47 
BF 32.97 32.97 32.97

US Patent Application 20190369372

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