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Patent for wide angle fluorite concepts
Canon has filed patent for a wide angle fluorite concept. Such a patent could be part of a new ultra-wide zoom lens, perhaps a 14-24 or a replacement to the 16-35. Egami also thinks it's possible this patent could be for the EF-M mount. It's an interesting read, even when Google translated. Read the full patent here.
- Patent Publication No. 2013-37339
- 2013.2.21 Release Date
- Filing date 2011.7.12
- Example 1
- Zoom ratio 1.00
- Focal length f = 1.00mm
- Fno. 2.90
- Half angle of view ω = 56.66 °
- Image height Y = 1.52mm
- 9.51mm length lens
- BF 2.82mm
- 6 aspherical surfaces, the first surface 25
- Punctually
- Example 3
- Zoom ratio 2.06
- 2.06mm – f = 1.00 focal length
- Fno 2.79 -. 4.00
- Half angle of view ω = 51.27 – 32.82 °
- 1.33mm – Y = 1.25 image height
- 8.55mm – 8.79 length lens
- BF 2.41 – 3.46mm
- Aspheric first surface, the fifth surface, the first surface 26
- Positive and negative positive negative
- Example 6
- Zoom ratio 1.00
- Focal length f = 1.00mm
- Fno. 2.90
- Half angle of view ω = 87.35 °
- Image height Y = 21.60mm
- 9.51mm length lens
- BF 2.82mm
- 6 aspherical surfaces, the first surface 25
- Punctually
Source: [EG]
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