Patent: Canon appears to be continuing development of EF mount optical formulas

Last updated: August 5, 2019 9:20 am

Published: August 5, 2019

1 Min Read

When you purchase through links on our site, we may earn an affiliate commission. Here's how it works.

A patent showing continued development in EF mount optical formulas has appeared at the Japan Patent Office this past week.

This patent covers two optical formulas, one being an EF 20mm f/1.4 and the other being an EF 12-24mm f/4.5-5.6.

I don't feel either of these optical formulas will become new products and this is more about the development of lens technologies than the optical formulas themselves.

Canon EF 20mm f/1.4

Focal length: 20.50mm
FNo: 1.44
Image height: 21.64mm
Lens length: 134.70mm
Back focus: 36.81mm

Canon EF 12-24mm f/4.5-5.6

Focal length: 12.40-18.00-23.64mm
FNo: 4.35-4.96-5.60
Image height: 21.64mm
Lens length: 142.18-132.82-131.14mm
Back focus: 36.14-44.23 -52.29mm

TAGGED:EF 12-24 f/4.5-5.6 EF 20 f/1.4 patent

Share This Article

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.