Canon Patent For 400mm F2.8, 500mm F4 and 600mm F4 Lenses For EOS R Mirrorless System

Canon Patent

Hi Lows Note spotted a Canon patent application (2019-95525, Japan) which describes optical formulas for telephoto lenses for the Canon EOS R full frame mirrorless system.

The optical formulas are for 400mm f2.8, 500mm f4 and 600mm f4 lenses.

Focal length: 392mm
FNo.: 2.90
2ω: 3.16
Image height: 21.64 mm
Lens length: 360.03 mm
Back focus: 31.01 mm

Focal length: 490mm
FNo.: 4.12
2ω: 2.54
Image height: 21.64 mm
Lens length: 412.08 mm
Back focus: 33.39 mm

Focal length: 588mm
FNo.: 4.12
2ω: 2.11
Image height: 21.64 mm
Lens length: 476.08 mm
Back focus: 33.21 mm

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

Canon Researching How To Make IBIS and Lens IS Work Together Smoothly, Patent Suggests

Ibis Canon Rumors Canon Full Frame Mirrorless

Canon patent application 2019-087397 (Japan) discusses how to make IBIS (In Body Image Stabilisation) work with lens-based image stabilisation. Not an easy task, I guess.

This is not the first IBIS-related patent filed by Canon. It’s now safe to assume that Canon will indeed implement IBIS in a future mirrorless camera (both EOS M and EOS R?).

Given the quantity of Canon lenses with IS it was to expect that Canon is interested to make IBIS wok with image-stabilised lenses.

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

Latest Canon Patent Applications (celestial AF, improved viewfinder, IS on tilt-shift, telephoto)

Canon Patent

US Patent Application 20490158760 discusses how to get better autofocus performance when picturing objects in the sky, like the moon.

In recent years, the number of pixels in image capturing apparatuses such as cameras and videos has increased, a slight defocus state of an image has become conspicuous and, more precise focusing is desired. This is the same in shooting an image of celestial bodies (stars, moon, and so forth) in the night sky. 

Focusing on celestial bodies is performed by calculating a focus position at which an area represented by high brightness signals is strictly minimized when regarding each celestial body as a point light source. As stars and the moon which are subjects in astrophotography at night are located substantially at infinity and there are specific exposure settings for astrophotography, there is an independent shooting mode for astrophotography different from other scene modes. Hereinafter, a mode for shooting the moon as the main subject is referred to as a “moon shooting mode”. 

Normally, the focus position at which an object located substantially at infinity is in focus is uniquely determined by performing infinite focus adjustment in individual image capturing apparatus. However, due to a difference between temperature at a time of the infinite focus adjustment and temperature of the image capturing apparatus at a time of actually shooting a celestial body, a difference in posture, and so forth, the focus may shift during shooting. For this reason, it is necessary to often adjust focus even during shooting a celestial body whose distance from the image capturing apparatus does not substantially change during shooting. 


Japan Patent Application 2019-078959 describes am improved viewfinder which improves on aberrations and magnification while maintaining a long eyepoint.

[…] the focal length of the eyepiece is about 65 mm, and the finder magnification is about 0.8 or less when the standard lens with a focal length of 50 mm is mounted as a photographing lens. 
Therefore, in a camera using a so-called APS-C size sensor in which the size of the image circle is smaller than a 35 mm film, the finder image becomes smaller than the conventional silver halide film camera. 
Further, in the prior art disclosed in Patent Document 2, although the finder magnification is as high as about 1 time, it is difficult to sufficiently correct axial chromatic aberration and lateral chromatic aberration. 
Therefore, an object of the present invention, while increasing the magnification while maintaining high optical performance, is to provide a finder optical system capable of ensuring long eye point. 

Japan Patent Application 2019-078903 describes how to implement an image stabilisation system on a tilt-shift lens while also lowering the power consumption.

It is an object of the present invention to provide a lens apparatus capable of reducing the power consumption while being able to shoot under an eyebrow and correct the shake, and an image pickup apparatus using the same. 
To achieve the above object, a lens device of the present invention, 
  – an optical system comprising a plurality of lenses, 
  – the shake correction lens of the plurality of lenses the optical system A – driving unit for moving in a direction crossing the optical axis;

A tilt unit for tilting the optical system and a control unit for controlling the drive unit are provided, and the control unit is configured to make the tilt amount of the optical system generated by the tilt unit smaller than a predetermined tilt amount. When the first tilt amount and the shake amount applied to the optical system are the first shake amount larger than a predetermined shake amount, the shake correction lens is in a direction crossing the optical axis. The drive unit is controlled to move in a direction intersecting the optical axis with a first drive amount smaller than the maximum drive amount of the shake correction lens 
  According to the present invention, it is possible to provide an imaging apparatus using the lens apparatus and which capable of reducing power consumption as well as a possible tilt shooting and shake correction . 


Japan Patent Application 2019-078948 describes various optical formulas for telephoto lenses and how to reduce chromatic aberrations.

  • focal length 392.55 
  • f-number 2.90 
  • half angle of view 3.15 
  • image height 21.64 
  • total lens length 372.00 
  • BF 60.70 
  • focal length 292.46 
  • f-number 2.90 
  • half angle of view 4.23 
  • image height 21.64 
  • lens total length 273.98 
  • BF 62.03 
  • focal length 488.82 
  • F number 4.10 
  • half angle of view 2.53 
  • image height 21.64 
  • lens total length 411.90 
  • BF 71.62 
  • focal length 778.70 
  • F number 5.83
  • Half angle of view 1.59 
  • image height 21.64 
  • lens total length 486.03 
  • BF 71.54

US Patent Application 20190155003 describes optical formulas for more telephoto lenses. As with the previous patent application, here too reduction of chromatic aberrations is discussed.

In an ultra-telephoto lens, generally, the longer the focal length, the more axial chromatic aberration or magnification chromatic aberration occurs. As a technique for excellently correcting these types of chromatic aberration, a technique for increasing the number of lenses placed on an object side and causing the lenses to share the action of correcting chromatic aberration is known. However, the effective diameter of a lens placed on the object side of the ultra-telephoto lens is likely to be large. Thus, if an attempt is made to correct chromatic aberration by the above technique, the weight of an imaging optical system increases. 

Source: Canon News

Canon Patent for 100mm f/1.4 and 135mm f/1.8 Lenses for EOS R System

Canon Patent

US patent application US20190146195 describes the optical formulas for 100mm f/1.4 and 135mm f/1.8 lenses for the Canon EOS R system.

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

Canon Patent for RF 17-34mm f/4-5.6 Lens for EOS R Systems

Canon Patent

Hi Lows Note spotted a Canon patent application (Japan, 2019-074633) describing the optical formula for a 17-34mm f/4-5.6 lens for the Canon EOS R mirrorless system.

  • Zoom ratio: 1.94
  • Focal length: 17.50 – 27.00 – 33.95 mm
  • F number: 3.94 – 3.92 – 5.69
  • Angle of view: 51.03 – 38.71 – 32.51
  • Image height: 21.64 mm
  • Lens length: 122.00 – 119.11 – 121.87 mm
  • Back focus: 20.00 – 31.62 – 40.07 mm

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

Latest Canon Patent Applications (fast EF lenses, RF lenses, wide angle zooms)

Canon Patent

Here is a list of Canon patent applications.

Canon patent application in Japan 2019-066586 describes optical formulas for various fast prime lenses for the EOS M system.

  • 20mm 1.4
  • 14mm 1.8
  • 22mm 1.2
  • 24mm 1.2

Focal distance 20.50 20.45 20.26 
F number 1.45 1.45 1.45 
Half field angle 46.54 46.54 46.54 
Image height 21.64 21.64 21.64 
Whole length of the lens 100.04 99.55 97.71 
BF 38.32 38.81 40.65 

Focal distance 18.52 18.46 18.25 
F number 1.31 1.31 1.31 
Half field angle 49.44 49.53 49.85 
Image height 21.64 21.64 21.64 
Whole length of the lens 106.98 106.51 104.95 
BF 38.97 39.44 41.00 

Focal distance 14.69 14.68 14.64 
F number 1.85 1.85 1.85 
Half field angle 55.82 55.85 55.91 
Image height 21.64 21.64 21.64 
Whole length of the lens 104.15 103.78 102.95 
BF 38.33 38.70 39.53 

Focal distance 22.69 22.60 22.20 
F number 1.24 1.24 1.25 
Half field angle 43.63 43.75 44.27 
Image height 21.64 21.64 21.64 
Whole length of the lens 107.46 106.9 104.5 
BF 38.32 38.88 41.28 

Focal distance 24.10 24.03 23.69 
F number 1.24 1.24 1.24 
Half field angle 41.92 42.00 42.40 
Image height 21.64 21.64 21.64 
Whole length of the lens 108.28 107.72 104.96 
BF 38.33 38.89 41.65 


Canon patent application in Japan 2019-066585 describes more optical formulas for fast primes lenses for the EOS M system.

  • 20mm 1.4
  • 16mm 1.4
  • 14mm 1.8
  • 17mm 1.8
  • 16mm 1.8
  • 18mm 1.8

Focal distance 20.50 20.45 20.26 
F number 1.45 1.45 1.45 
Half field angle 46.54 46.54 46.54 
Image height 21.64 21.64 21.64 
Whole length of the lens 100.04 99.55 97.71 
BF 38.32 38.81 40.64 

Focal distance 16.40 16.36 16.21 
F number 1.45 1.45 1.45 
Half field angle 52.84 52.84 52.84 
Image height 21.64 21.64 21.64 
Whole length of the lens 98.97 98.65 97.42 
BF 38.50 38.83 40.05 

Focal distance 14.40 14.38 14.29 
F number 1.83 1.83 1.83 
Half field angle 56.35 56.35 56.35 
Image height 21.64 21.64 21.64 
Whole length of the lens 88.57 88.32 87.42 
BF 38.79 39.04 39.94 

Focal distance 17.16 17.14 17.06 
F number 1.83 1.83 1.83 
Half field angle 51.58 51.58 51.58 
Image height 21.64 21.64 21.64 
Whole length of the lens 90.00 89.66 88.39 
BF 40.51 40.86 42.12 

Focal distance 16.04 16.00 15.86 
F number 1.83 1.83 1.83 
Half field angle 53.45 53.45 53.45 
Image height 21.64 21.64 21.64 
Whole length of the lens 94.99 94.67 93.46 
BF 38.80 39.13 40.33 

Focal distance 18.81 18.75 18.52 
F number 1.83 1.83 1.83 
Half field angle 48.99 48.99 48.99 
Image height 21.64 21.64 21.64 
Whole length of the lens 93.37 93.37 93.37 
BF 39.52 39.52 39.52


Canon patent application in Japan 2019-066653 describes optical formulas for 14-40mm f/4 and 16-40mm f/4 lenses for the EOS R system.

Focal distance 14.43 21.62 40.74 
F number 4.12 4.12 4.12 
Half field angle 56.30 45.01 27.97 
Image height 21.64 21.64 21.64 
Whole length of the lens 138.31 128.15 129.29 
BF 12.84 12.84 12.84

Focal distance 16.41 23.12 38.80 
F number 4.12 4.12 4.12 
Half field angle 52.82 43.10 29.14 
Image height 21.64 21.64 21.64 
Whole length of the lens 118.88 112.53 114.89 
BF 12.78 12.78 12.78 


Canon patent application in Japan 2019-066654 describes optical formulas for 15-35mm f/4 and 16-35mm F/4 lenses for the EOS R system.

Focal distance 15.45 24.00 34.00 
F number 4.12 4.12 4.12 
Half field angle 54.47 42.03 32.47 
Image height 21.64 21.64 21.64 
Whole length of the lens 125.38 119.21 116.89 
BF 12.00 19.66 24.40 

Focal distance 16.48 24.00 34.00 
F number 4.12 4.12 4.12 
Half field angle 52.70 42.03 32.47 
Image height 21.64 21.64 21.64 
Whole length of the lens 127.27 116.39 111.30 
BF 10.95 16.82 23.58 


And finally, Canon patent application in Japan 2019-066701 describes optical formulas for two more RF lenses:

Canon RF 15-35mm f/2.8L

Focal distance 15.30 24.20 34.00 
F number 2.91 2.91 2.91 
Field angle 54.73 41.80 32.47 
Image height 21.64 21.64 21.64 
Whole length of the lens 135.05 125.84 125.33 
BF 13.00 22.20 32.26 
 

Canon RF 17-70mm f/3.5-5.6

Focal distance 17.30 35.00 68.00 
F number 3.58 4.18 5.85 
Field angle 51.35 31.72 17.65 
Image height 21.64 21.64 21.64 
Whole length of the lens 142.70 138.53 143.42 
BF 13.32 29.60 57.62 

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

Source: Canon News