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Canon 400mm F2.8 RF Lens with Built-in 1.4X Teleconverter Rumors
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From the
patent:
- Focal length: 389.00
- F-value: 2.91
- Half angle of view: 3.18
- Image height: 21.64
- Total length: 406.00
- Back focus: 53.83
With the built-in teleconverter engaged:
- Focal length: 544.00
- F-value: 4.19
- Half angle of view: 2.28
- Image height: 21.64
- Overall length: 406.01
- Back focus: 53.83
