Skip to content

Canon Patent: 10-20mm f/4, 9-18mm f/4, And 11-22mm f/4 For RF mount

Canon Patent
Drawing from the patent literature

A new Canon patent, and as almost all Canon patents of the last two or three years it is for RF mount lenses.

Canon patent 2023005851 (Japan, published 1/18/2023) discusses optical formulas for three wide angle lenses for the RF mount:

  • 10-20mm f/4
  • 9-18mm f/4
  • 11-22mm f/4

The 11-22mm in the list above could well be the already rumored 11-22mm lens. From the patent literature:

An object of the present invention is to realize a negative lead zoom lens that is compact and has a wide angle of view and yet has high optical performance in a wide zoom range.

Example 1

  • Focal length: 10.30-19.40
  • F-value: 4.12
  • Half angle of view: 62.03-48.12
  • Image height: 19.40-21.64
  • Overall length: 129.14-132.69
  • Back focus: 15.09

Example 2

  • Focal length: 9.27-17.46
  • F-value: 4.12
  • Half angle of view: 64.34-51.10
  • Image height: 19.30-21.64
  • Total length: 124.52-125.00
  • Back focus: 15.37

Example 3

  • Focal length: 11.33-23.28
  • F-value: 4.12
  • Half angle of view: 59.58-42.90
  • Image height: 19.30-21.64
  • Total length: 130.00-131.90
  • Back focus: 16.34

More Canon patent applications are listed here. Some particularly interesting patent applications we think might get into production are these:

[via asobinet]

Back To Top

Notice

This website or its third-party tools use cookies, which are necessary to its functioning and required to achieve the purposes illustrated in the cookie policy. If you want to know more or withdraw your consent to all or some of the cookies, please refer to the cookie policy.
By closing this banner you agree to the use of cookies.