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

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:

• RF 16-28mm lens with either f/2.8, f/2.8-4, or f/4
• Automatic shutter silencing based on subject and distance
• A bunch of prime lenses for the RF mount
• An improved Electronic Viewfinder
• Patent application for RF 50mm F1.4 and an RF 35mm f/1.4 lenses
• A zoom lens that might be for an EOS R with APS-C sensor
• A smaller IBIS unit.
• A cooling adapter for the RF mount (R5 overheating?)
• A bunch of macro lenses for the RF mount.
• A 8mm f/4 circular fisheye lens for the Canon EOS R system
• A battery grip that works with differently siszed cameras
• A 100-400mm f/5.5-7.1 lens for APS-C cameras. EOS M or DSLR?
• RF 17-70mm lens for EOS R system
• IBIS coming to the EOS M and PowerShot lineup?
• Patent Application: mirrorless camera with large display and virtual control wheel
• Patent Application: IBIS and Lens IS Working Together
• Patent application for high speed mirror movement and control
• Patent application for an RF 14-28mm f/2 lens
• Patent application for an RF 50mm f/1.8 lens
• Patent application for a smart lens cap
• Patent application for celestial auto-focus
• Patent application describing a Pop-Up Flash With LED
• Patent application describing the optical formula for a RF 70-300mm F/4-5.6 IS lens for EOS R systems
• Patent application describing how to improve burst rate by compressing raw files
• Patent application describing a new way to review photos from a sequential shot
• Patent application that describes technology to improve wireless communication while reducing power consumption
• Patent application to spot and reduce moire artefacts in image data
• Patent application for weather sealed lens adapter
• Patent application for AI powered predictive camera control system
• Patent application for 18-55mm kit lens with LCD display
• Patent application to reduce noise in image files

[via asobinet]