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| EF 50mm f/1.2 lens design for full frame mirrorless DSLR ? |
Our friends at Egami (Japanese Photography Blog) has discovered a patent from Canon Japan that suggest they are working on two new lens design, the EF 50mm f/1.2 and the EF 50mm f/2 that may be eventually mated to a full frame mirrorless camera. You can read the Google translation of the article from Egami.
Patent description :
Patent Publication No. 2012-247451
Release Date 2012.12.13
Filing date 2011.5.25
Example One
- Focal length f = 51.70mm
- Fno. 1.25
- Half angle of view ? = 22.71 °
- Image height 21.64mm
- 105.65mm length lens
- BF 40.00mm
- Nine 6 groups lens configuration
- One one aspherical surface
- Maximum effective diameter 45.16mm
Example Four
- Focal length f = 50.00mm
- Fno. 2.06
- Half angle of 23.40mm
- Image height 21.64mm
- Length 72.62mm lens
- BF 28.86mm
- Eight four group lens configuration
- No aspherical
- Maximum effective diameter 33.34mm
General symmetric lens
- Compensation of magnification chromatic aberration can be
- Difficult to correct axial chromatic aberration and the large-diameter
Canon patent
- Symmetric lens large aperture
- Positive, aperture, arranged in the order of the positive
- Using a high anomalous dispersion glass, the axial chromatic aberration is corrected
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