Mirror lenses have a bad wrap, as most of the implementations out there are for long and slow lenses, this patent discovered by asobinet shoes that Canon has been working on fast aperture mirror lenses.
Whether these ever make it to market remains to be seen.
Canon 300mm f/2.4 Mirror Lens
- Focal length:298.89mm
- F-number: 2.28
- Half angle of view: 4.14°
- Height: 21.64mm
- Length Overall: 177.20mm
- Back Focus: 65.95mm
Canon 400mm f/5 Mirror Lens
- Focal length: 408.04mm
- F-number: 5.00
- Half angle of view: 3.04°
- Height: 21.64mm
- Length Overall: 189.17mm
- Back Focus: 47.69mm
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