Canon Patent: RF 9-18mm f/4 Wide Angle Zoom For EOS R System

Canon Patent

Here is a new Canon patent application, and it is a rather interesting one.

Canon patent application P2022065383 (Japan) discusses optical formulas for a RF 9-18mm f/4 wide angle zoom lens for the Canon EOS R system.

PROBLEM TO BE SOLVED: To provide a zoom lens which is compact and has high resolving power while having a wide angle of view.

With the increase in the number of pixels of an image pickup apparatus, there is a demand for a zoom lens having a wide angle and high optical performance. Patent Document 1 discloses a wide-angle zoom lens having a focal length at a wide-angle end of about 11 mm in terms of 35 mm and an angle of view of about 120 °.

However, when the zoom lens is widened, the refractive power of each lens constituting the zoom lens increases and the resolution decreases.

The present invention provides a zoom lens having a wide angle of view, yet being compact and having high resolving power.

Example 1

  • Focal length: 9.27-17.46
  • F value: 4.12
  • Half angle of view: 66.80-51.10
  • Image height: 21.64
  • Overall length: 130.07-127.77
  • Back focus: 11.00

The Canon patent was spotted by Asobinet. More Canon patent applications are listed here. Some particularly interesting patent applications we think might get into production are these:

Canon patent for EF-M 9-18mm f/3.5-4.5 STM lens

canon patent

Something is moving in Canon’s EOS M department. Here we have another Canon patent for an EF-M lens,, a EF-M 9-18mm f/3.5-4.5 STM.

We already have an ultra wide-angle lens for the EOS M system, the EF-M 11-22mm f/4-5.6 IS STM. Will the optic formula described in the Canon patent ever hit the market? Hard to say.

  • Patent Publication No. 2016-54371
    • Published 2016.4.14
    • Filing date 2014.9.3
  • Example
    • Zoom ratio 1.90
    • Wide-angle intermediate telephoto
    • Focal length 9.22 14.05 17.50
    • F-number 3.39 4.04 4.63
    • Half angle of view (degrees) 53.07 44.12 37.91
    • Image height 12.27 13.63 13.63
    • Overall length of the lens 89.68 83.60 86.84
    • BF 14.22 15.78 16.00
  • Canon patent
    • Upon correction of the distortion, providing a constraint on stretching amount at each image height
    • Properly set the curve shape of the distortion aberration

[via Egami]

Canon Patent for EF-S 9-18mm f/4.5-5.6 Lens


Egami (translated) spotted a patent filed by Canon for a 9-18mm f/4.5-5.6 IS STM lens for APS-C cameras. The lens design looks similar to the recently announced EF-S 10-18mm f/4.5-5.6 IS STM.

  • Patent Publication No. 2014-225002
    • Published 2014.12.4
    • Filing date 2013.4.25
  • Canon patent
    • 4-group configuration of negative positive and negative positive
    • Inner focus
    • And a plastic aspherical first lens group
    • [0013] According to the present invention, the change in imaging magnification upon focusing on less, high speed focusing is obtained zoom lens easy wide angle.