Canon 400mm F/5.6 MIRROR (Catadioptric) Lens Patent

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The current Canon EF 400mm f/5.6L USM Lens

Canon has filed a new lens patent for 400mm F/5.6 MIRROR (Catadioptric) Lens, and this could be an EF-M mount lens.

The blue bits are mirrors. The light comes in through L1, bounces off M1/M2 and through a hole in M1 back to the camera.

Take a look at the patent details below:

  • Focal length: 400mm
  • Aperture: f/5.6
  • 2 ω: 1.96
  • Image height: 13.66mm
  • Back focus: 33.07mm
  • Lens length: 247.73mm

Via: northlight-images