Here’s a crazy optical formula patent from Canon, an EF 40-800mm f/4.5-5.6 superzoom lens. The folks at Egami say it’s for a full frame DSLR and is an internal zoom lens.

Patent Publication No. 2016-128846 (Google Translated)

Published 2016.7.14

Filing date 2015.1.9

Zoom ratio 19.42

Focal length 41.09 92.80 152.20 225.00 797.99

F-number 4.67 4.66 4.65 4.67 5.71

Angle of view 27.79 13.13 8.10 5.50 1.55

Image height 21.65

Overall length of the lens 489.32

BF 39.28

Inner zoom

As pointed out on our forum, the patent contains 4 lens designs, two of them are for full frame, and two are for a PowerShot application. The likelihood of such a lens coming to fruition in full frame form? I’d say zero chance, but stranger things have happened.