Canon Patents

Patent: Canon 500mm f/4 DO IS and Canon 600mm f/4 DO IS

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It seems patent applications for diffractive optic super telephoto lenses is becoming a monthly thing. Canon News has uncovered another patent application showing both a 500mm f/4 DO IS and a 600mm f/4 DO IS example.

Canon showcased a 600mm f/4 DO IS at the Canon Expo back in 2015, and we haven’t really heard anything else about it since. There seems to be a lot of resources being put into DO lenses and yet we only have one available from Canon in the EF 400mm f/4 DO IS II.

We predict that the RF mount will get some DO lenses in the future for the obvious reasons of size and weight reduction, which is especially important for a lot of super telephoto shooters.

Japan Patent Application 2019-008047

Canon 600mm f/4 DO IS

  • Focal distance: 584.99mm
  • F number: 4.12
  • A half field angle: 2°
  • Image height: 21.64
  • Length of the lens: 474.74mm
  • Backfocus: 109.42mm

Canon 500mm f/4 DO IS

  • Focal distance: 487.49mm
  • F number: 4.12
  • A half field angle:  2.54°
  • Image height: 21.64
  • Length of the lens: 409.74mm
  • Backfocus: 98.4mm