Patent: EF 20-45mm f/2.8-4

Last updated: May 6, 2025 3:49 am

Published: November 20, 2015

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A patent for an optical formula of 20-45mm f/2.8-4 has appeared. As suggested at Northlight, this sort of optical formula could end up being a 17-40 type of replacement, or even part of the new EF 16-35 f/2.8L II development.

Patent Publication No. 2015-197593 (Google Translated)

Published 2015.11.9
Filing date 2014.4.1
Zoom ratio 2.25
Focal length f = 20.00 23.60 45.00
Fno. 2.75 2.90 4.16
Half angle of 47.25 42.51 25.68
Image height 21.64 21.64 21.64
Overall length 158.28 156.32 173.36
BF 42.05 46.10 73.14

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ByCraig Blair

Craig is the founder and editorial director for Canon Rumors. He has been writing about all things Canon for more than 17 years. When he's not writing, you can find him shooting professional basketball and travelling the world looking for the next wildlife adventure. The Canon EOS R1 is his camera of choice.