Canon Patent: Various Telephoto Zoom Lenses For The RF Mount

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