不知道有沒lag 先op再說
這隻經典名鏡，再次進化!!
期待阿
EF 35MM F1.4 L II USM我沒有把L塗紅喔
http://www.canonrumors.com/2012/07/patent-canon-ef-35-f1-4l/
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.
Canon EF 35 f/1.4L II?
Patent Publication No. 2012-123155
■2012.6.28 Release Date
■2010.12.8 filing date
專利圖
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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