Egami (machine translated) spotted a new Canon patent. This time it is for a 35mm f/1.4 prime lens. The existing EF 35mm was released in 1998, so it makes sense for Canon to work on a new release of this lens. According to Egami, it looks as if Canon has been working since four years on this lens.
Details (machine translated):
- Patent Publication No. 2012-123155
- 2012.6.28 Release Date
- 2010.12.8 filing date
- Example 1
- Focal length f = 34.73mm
- Fno. 1.45
- Half angle of 31.92 deg.
- Image height 21.64mm
- Length 128.11mm lens
- 38.48mm back focus
- An effective diameter of 52.03mm lens
- Effective diameter aperture 25.52mm
- Lens Construction 12 elements in 9 groups sheet
- 2 2 aspherical surface
- And retro focus lens optical system focal length is shorter than the length of the optical system
- Increasingly asymmetric refractive power arrangement must be strengthened a negative refractive power of the front group in particular
- Coma aberration, astigmatism, spherical aberration occurs
- Order to secure a back focus must be to increase the ratio retro
- Pettsuvu~aru sum is reduced and off-axis aberration (field curvature, distortion) is worse
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