Canon Patent: 20mm f/1.8 And 23mm f/1.8 Lenses For The RF Mount

And here is yet another Canon patent discussing optical formulas for lenses for the EOS R full frame mirrorless system.

Canon patent application P2021-71624A (Japan) discusses optical designs for a 20mm f/1.8 lens and a 23mm f/1.8 lens for full frame mirrorless systems. That’s the RF mount. The patent was spotted by Hi Lows Note.

Embodiment 1: RF 23mm f/1.8

• Focal length 23.40 mm
• F number 1.85
• Half angle of view (degree) 42.76
• Image height 21.64 mm
• Lens length 89.32 mm
• BF 11.72 mm

Embodiment 2: RF 23mm f/1.8

• Focal length 23.28 mm
• F number 1.85
• Half angle of view (degree) 42.90
• Image height 21.64 mm
• Lens length 93.32 mm
• BF 12.72 mm

Embodiment 3: RF 20mm f/1.8

• Focal length 20.60 mm
• F number 1.85
• Half angle of view (degree) 46.40
• Image height 21.64mm
• Lens length 88.73 mm
• BF 11.72 mm

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