And here is another Canon patent application for telephoto zoom RF mount lenses. No doubt left that Canon is heavily investing in the EOS R full frame mirrorless system.

Canon patent application P2021-56407A (Japan) discusses optical formulas and designs for a bunch of telephoto zoom lenses for the RF mount. However, one of the optical designs listed below is for an APS-C sensor, so either for the EOS M (likely) or for Canon’s crop sensor DSLR lineup. The patent application was spotted by Hi Lows Note.

Embodiment 1

• Zoom ratio 2.68
• Focal length 72.27 135.02 193.89 mm
• F number 4.08 4.08 4.12
• Half angle of view（°） 16.67 9.10 6.37
• Image height 21.64 21.64 21.64 mm
• Lens length 137.50 175.84 193.12 mm
• BF 14.44 24.23 29.66 mm

Embodiment 2

• Zoom ratio 4.82
• Focal length 101.59 200.00 490.00 mm
• F number 4.60 5.09 6.80
• Half angle of view（°） 12.02 6.17 2.53
• Image height 21.64 21.64 21.64 mm
• Lens length 222.29 279.43 312.29 mm
• BF 21.06 29.20 64.12 mm

Embodiment 3

• Zoom ratio 2.69
• Focal length 72.13 100.00 194.06 mm
• F number 2.89 2.89 2.91
• Half angle of view（°） 16.70 12.21 6.36
• Image height 21.64 21.64 21.64 mm
• Lens length 161.59 187.06 220.03 mm
• BF 15.86 20.68 31.81 mm

Embodiment 4 (for APS-C sensor)

• Zoom ratio 4.24
• Focal length 56.90 130.00 241.30 mm
• F number 4.68 5.88 6.55
• Half angle of view（°） 13.50 6.00 3.24
• Image height 13.66 13.66 13.66 mm
• Lens length 102.01 140.24 153.08 mm
• BF 13.47 21.19 39.32 mm

Embodiment 5

• Zoom ratio 3.75
• Focal length 103.39 196.91 387.69 mm
• F number 5.77 7.10 8.24
• Half angle of view（°） 11.82 6.27 3.19
• Image height 21.64 21.64 21.64 mm
• Lens length 165.42 201.96 235.42 mm
• BF 13.85 33.27 57.50 mm

Embodiment 6

• Zoom ratio 3.88
• Focal length 100.04 198.04 387.80 mm
• F number 5.77 7.10 8.24
• Half angle of view（°） 12.20 6.23 3.19
• Image height 21.64 21.64 21.64 mm
• Lens length 159.40 202.97 229.40 mm
• BF 10.02 28.12 62.23 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