Canon has just filed two new patents for super telephoto lenses. One is Canon 300mm F2.8 DO and the other is 400mm F2.8 DO.
See the details below:
Japan Patent Application 2018-189878
- Focal distance 392.58
- F number 2.91
- a half field angle 3.15
- Image height 21.64
- length of the lens 363.53
- BF 59.15
- Focal distance 293.40
- F number 2.91
- a half field angle 4.22
- Image height 21.64
- length of the lens 274.00
- BF 59.35
Read More Canon Lens Patent