Canon EF 35 f/1.4L Patent
A new patent for a 35mm f/1.4 optical formula has appeared. This is the first to appear since 2011 in regards to an updated 35 f/1.4L. View the previous patent here.
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
- 2 UD glass sheet
Retrofocus
- 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
Source: [EG]
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