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In a patent uncovered by Canon News, it appears Canon is continuing the development of EF telephoto lenses. This patent is related to the focusing speed of the lenses as well as the reduction in aberrations.
Canon EF 300mm f/2.8L IS USM
- Focal length: 294.00mm
- F number: 2.91
- Half angle of view: 4.21°
- Image height: 21.64mm
- Total lens length: 276.40mm
- BF: 65.35mm
Canon EF 400mm f/2.8L IS USM
- Focal Length: 392.00mm
- F number: 2.90
- Half angle of view: 3.16°
- Image height: 21.64mm
- Total lens length: 371.25mm
- BF: 69.92mm
Canon EF 500mm f/4L IS USM
- Focal Length: 490.00mm
- F-number: 4.12
- Half angle of view: 2.53°
- Image height: 21.64mm
- Total lens length: 410.77mm
- BF: 66.03mm
Canon EF 600mm f/4L IS USM
- Focal length: 588.00mm
- F-number: 4.12
- Half angle: 2.11°
- Image height: 21.64mm
- Total lens length: 474.78mm
- BF: 80.59mm
Canon EF 800mm f/5.6L IS USM
- Focal length: 784.00mm
- F-number: 5.80
- Half angle: 1.58°
- Image height: 21.64mm
- Total lens length: 484.53mm
- BF: 75.94mm
