Canon patents for 35mm F1.2 and 12mm F1.2 lenses

Canon patents for 35mm F1.2 and 12mm F1.2 lenses

The Canon RF 35mm f/1.2L USM has been on the RF optics roadmap for a long time, almost since the introduction of the system. And a patent for it, among others, appeared 2 years ago, but the lens was never released.

Now, the Asobinet resource has information about two new patents describing the optical design of lenses, including 1.2 / 35.

Canon 35mm f/1.2


  • Focal Length: 33.53mm
  • Aperture: F/1.30
  • Half FOV: 32.83°
  • Image Height: 21.64mm
  • Overall length: 61.97mm
  • Back focus: 0.29mm

The same patent also shows a fast ultra wide-angle prime lens with the same short back focus distance.

Canon 12mm f/1.2

  • Focal Length: 12.40mm
  • Aperture: F/1.30
  • Half FOV: 32.82°
  • Image height: 8.00 mm
  • Overall length: 21.76mm
  • Back focus: 0.44mm

* * *

In the description of the optical formulas, the f / 1.3 aperture appears, but if they reach real products, they will most likely be rounded up to the usual f / 1.2 or f / 1.4.
Something else is more interesting. If you paid attention, the description gives extremely small back focus values ​​​​for both lenses (0.29 and 0.44 mm), which casts doubt on the possibility of their use with consumer cameras. Most likely, this is still optics for industrial cameras with a special mechanism for bringing the lens closer to the sensor to the working distance after installation on the camera.

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