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I'll be honest, the first 20 or so patents relating to diffractive optics lenses had me excited about what was coming down the pipeline. However, the last bunch of patents for DO optical formulas hasn't really given me a lot of hope that we're going to see new and exciting super telephoto lenses from Canon.
Below are three embodiments that show 400mm, 600mm, and 800mm DO optical formulas.
Japan Patent Application 2019-028317
Canon 600mm f/4 DO IS
- Focal distance: 582.00mm
- F number: 4.12
- Half field angle: 2.13°
- Image height: 21.64mm
- Whole length of the lens: 394.25mm
- BF: 62.79mm
Canon 400mm f/4 DO IS
- Focal distance: 405.00mm
- F number: 4.12
- Half field angle: 3.06°
- Image height: 21.64mm
- Whole length of the lens: 330.16mm
- BF: 50.46mm
Canon 800mm f/5.6 DO IS
- Focal distance: 795.00mm
- F number: 5.60
- Half field angle: 1.56°
- Image height: 21.64mm
- Whole length of the lens: 490.24mm
- BF: 105.13mm
