And yet another Canon patent for RF-mount lenses spotted by asobinet.com. An RF 27mm f/1.4 and an RF 35mm f/1.4.

From the patent abstract:

In recent years, image pickup devices such as digital still cameras, video cameras, surveillance cameras, broadcasting cameras, and silver halide photography cameras using a solid-state image sensor have become more sophisticated. As an optical system used for this, the entire focus group is required to be miniaturized. Further, there is a demand for an optical system capable of satisfactorily correcting chromatic aberration, curvature of field, etc. at the time of shooting at the nearest distance while increasing the shooting magnification when focusing from infinity to the nearest distance. Further, with the shift to mirrorless large format cameras, there is a demand for a lens having a short back focus, a small size, and a large aperture. As an optical system that satisfies these requirements, a lens group having a positive refractive power, a focus lens group having a positive refractive power, and a focus lens group having a positive refractive power, which are arranged in order from the object side to the image side, are used.

It seems keeping thing small and light-weighted is a major topic in Canon’s R&D department.

Optical formulas for the 27mm lens:

Example 1

• Focal length 26.79
• F number 1.44
• Half angle of view (°) 38.93
• Image height 21.64
• Lens overall length 134.78
• BF 13.00

Example 2

• Focal length 26.62
• F number 1.44
• Half angle of view (°) 39.10
• Image height 21.64
• Lens overall length 131.96
• BF 20.00

Example 5

• Focal length 26.70
• F number 1.44
• Half angle of view (°) 39.02
• Image height 21.64
• Lens overall length 133.24
• BF 20.00

Optical formulas for the 35mm lens:

Example 3

• Focal length 33.73
• F number 1.44
• Half angle of view (°) 32.68
• Image height 21.64
• Lens overall length 143.92
• BF 20.00

Example 4

• Focal length 33.87
• F number 1.44
• Half angle of view (°) 32.57
• Image height 21.64
• Lens overall length 131.26
• BF 16.49

And here is a new Canon patent application for lenses for the RF mount: 22mm, 24mm, 33mm, 35mm, and all are f/1.4.

Canon patent application 2021-113905A (spotted by High Lows Note) discusses optical formulas for the following RF-mount lenses:

• RF 22mm f/1.4
• RF 24mm f/1.4
• RF 33mm f/1.4
• RF 35mm f/1.4

Here they are:

Embodiment 1

• FOCAL LENGTH (MM): 35.00
• F NUMBER: 1.42
• HALF ANGLE OF VIEW (DEGREE): 31.73
• IMAGE HEIGHT (MM): 21.64
• LENS LENGTH (MM): 126.05
• BACK FOCUS (MM): 11.06

Embodiment 2:

• FOCAL LENGTH (MM): 35.00
• F NUMBER: 1.42
• HALF ANGLE OF VIEW (DEGREE): 31.72
• IMAGE HEIGHT (MM): 21.64
• LENS LENGTH (MM): 128.31
• BACK FOCUS (MM): 11.06

Embodiment 3

• FOCAL LENGTH (MM): 34.99
• F NUMBER: 1.43
• HALF ANGLE OF VIEW (DEGREE): 31.73
• IMAGE HEIGHT (MM): 21.64
• LENS LENGTH (MM): 123.63
• BACK FOCUS (MM): 11.06

Embodiment 4:

• FOCAL LENGTH (MM): 24.17
• F NUMBER: 1.42
• HALF ANGLE OF VIEW (DEGREE): 41.83
• IMAGE HEIGHT (MM): 21.64
• LENS LENGTH (MM): 124.64
• BACK FOCUS (MM): 11.06

Embodiment 5:

• FOCAL LENGTH (MM): 33.11
• F NUMBER: 1.42
• HALF ANGLE OF VIEW (DEGREE): 33.17
• IMAGE HEIGHT (MM): 21.64
• LENS LENGTH (MM): 126.01
• BACK FOCUS (MM): 11.06

Embodiment 6:

• FOCAL LENGTH (MM): 33.03
• F NUMBER: 1.42
• HALF ANGLE OF VIEW (DEGREE): 33.23
• IMAGE HEIGHT (MM): 21.64
• LENS LENGTH (MM): 125.39
• BACK FOCUS (MM): 11.06

Embodiment 7:

• FOCAL LENGTH (MM): 34.99
• F NUMBER: 1.43
• HALF ANGLE OF VIEW (DEGREE): 31.73
• IMAGE HEIGHT (MM): 21.64
• LENS LENGTH (MM): 122.18
• BACK FOCUS (MM): 11.06

Embodiment 8:

• FOCAL LENGTH (MM): 22.00
• F NUMBER: 1.42
• HALF ANGLE OF VIEW (DEGREE): 44.52
• IMAGE HEIGHT (MM): 21.64
• LENS LENGTH (MM): 125.60
• BACK FOCUS (MM): 11.06

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

• 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