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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
