Canon Patent Shows RF Mount Zoom Lens That Could Be For An APS-C EOS R Camera

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Interesting Canon patent application. Various zoom lenses for the EOS R system are discussed, with one being particularly interesting since it seems to point to an APS-C EOS R.

Canon patent application (2020-170102, Japan) discusses optical formulas for zoom lenses for the Canon EOS R system. The patent literature discusses the following zoom lenses:

Example 1Example 2Example 3
Focal length24.72-67.9024.72-116.4024.72-101.85
F value4.124.04-7.314.29-7.31
Half angle of view41.50-17.3041.80-10.3041.80-11.80
Image height19.69-21.6419.90-21.6419.90-21.64
full length101.50-141.15109.01-159.02107.52-158.03
BF12.50-24.861415-31.0113.48-35.52
Example 4Example 5
Focal length27.72-82.4515.45-67.90
F value3.53-5.883.93-7.31
Half angle of view38.53-14.7042.40-11.37
Image height19.69-21.6412.56-13.65
full length101.50-142.5071.26-113.36
BF14.16-32.5212.40-24.51
Look at example 5

As you can see from the table above, there are 24-70mm, 24-116mm, 24-100mm, 27.80mm, and, listed under “Example 5”, a 15-70mm f/4-7.1 zoom lens with an image height that doesn’t work for a full frame sensor on a mirrorless camera. However, the lens is based on the same design principles as the others, so it might be for an APS-C EOS R camera.

If you have a better understanding of the patent (or of Japanese), spotted by asobinet.com, please help me out on this. Is this really a lens for an EOS R camera with an APS-C sensor??

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

Canon Working On An RF 8-15mm f/4 Fish-eye Zoom Lens, Patent Suggests

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A new Canon patent application suggests the company might have an interesting lens for the EOS R ecosystem up their sleeve.

Hi Lows Note spotted Canon patent application 2020-166234A (Japan), where optical formulas for an RF 8-15mm f/4 fish-eye lens are discussed. The lens seems to be pretty much the mirrorless counterpart to the EF 8-15mm f/4 fish-eye.

  • Zoom ratio: 1.85
  • Focal length: 8.10 12.51 15.01 mm
  • F number: 4.10 4.10 4.10
  • Half angle of view: 90.14 90.45 90.39
  • Image height: 11.50 18.00 21.60 mm
  • Lens length: 123.74 111.21 109.67 mm
  • Back focus: 11.78 20.27 24.66 mm

We think it’s very likely this lens will hit the market, sooner or later. Btw, it’s not the first patent for a fish-eye lens for EOS R.

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

Canon Working To Make IBIS Units Smaller, Patent Suggests

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It took Canon a long time to feature IBIS (In Body Image Stabilization) on their cameras. Now they are actively researching how to make it better. The Canon EOS R5 already has the best in its class.

Canon patent application 2020-140104 (Japan, spotted by Canon News) discusses technical aspects related to making an IBIS unit smaller. IBIS units are relatively bulky and take a considerable amount of space inside the camera. A smaller IBIS unit might mean an overall smaller camera.

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

Canon Patent For Cooling Adapter For The RF Mount

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Did Canon foresee the EOS R5/R6 overheating hysteria? A Canon patent suggests so.

Canon patent application 2019-186871 (Japan) describes an adapter for the Canon RF mount which seems to have the peculiar aim to cool down the camera body (item 100 in the image above).

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

Canon Patent: Electronic Viewfinder With Folded Optics

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Here is a Canon patent application for a new EVF (Electronic ViewFinder) for a mirrorless camera. Folded optics are employed.

Canon patent application 2020-95073A (Japan) discusses a new kind of Electronic Viewfinder featuring folded optics, a technology used for smartphone camera lenses and everywhere you want to have an optical path that’s longer than the size of the system. Prismatic binoculars being a good example.

The EVF in the patent literature uses polarized surfaces to maximize reflection. We think this patent might go into production, sooner or later. The patent application was spotted by Hi Lows Note.

folded optics

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

Canon Patent: Macro Lenses For EOS R System (85mm, 95mm, 100mm, all f/2.8)

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And now let’s go for one more Canon patent for an RF mount lens.

Canon patent application 2020-91334A (spotted by Hi Lows Note) discusses optical formulas for three macro lens for the RF mount.

RF 85mm F2.8 1:1 MACRO

  • Focal length: 84.92 mm
  • F number: 2.92
  • Half angle of view: 14.29
  • Image height: 21.64 mm
  • Lens length: 120.23 mm
  • Back focus: 10.60 mm

RF 95mm F2.8 1:1 MACRO

  • Focal length: 94.82 mm
  • F number: 2.92
  • Half angle of view: 12.85
  • Image height: 21.64 mm
  • Lens length: 124.00 mm
  • Back focus: 14.11 mm

RF 100mm F2.8 1:1 MACRO

  • Focal length: 99.75 mm
  • F number: 2.92
  • Half angle of view: 12.24
  • Image height: 21.64 mm
  • Lens length: 169.97 mm
  • Back focus: 14.00 mm

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