Canon 135mm f/2.8 and a 180mm f/3.5 Using An Apodization Filter
Japanese site Egami (machine translated) spotted another patent filed by Canon. This time it is about a 135mm f/2.8 and a 180mm f/3.5 lens. The news are an apodization filter that should help provide a more pleasant bokeh.
•Patent Publication No. 2012-128151
•2012.7.5 Release Date
•2010.12.15 filing date
•Example 1
•137.2mm – f = 135.0 focal length
•Fno 2.83 -. 3.90
•9.1 deg half each painting.
•Image height 21.60mm
•186.7mm – 150.0 full-length lens
•BF 47.4 – 80.7mm
•Lens Construction 10 elements in 7 groups sheet
•1 UD glass sheet
•0.25 times the maximum magnification ratio
•Example 6
•179.1mm – f = 180.0 focal length
•Fno 3.50 -. 4.00
•6.9 deg half each painting.
•Image height 21.60mm
•218.0mm – 199.8 full-length lens
•BF 70.0 – 89.8mm
•Lens Construction 11 elements in 7 groups sheet
•1 UD glass sheet
•0.11 times the maximum magnification ratio
•(Bokeh) out of focus look of the important
•Apodization filter
•The periphery of the filter transmittance is reduced
•Added to the luminous flux intensity distribution
•Bokeh is beautiful and the outline of the
•Apodization element variable
•If the liquid of same refractive index as the shape of the interface, no variation occurs in aberration
•To be the same refractive power of the two liquids, the Abbe number is difficult
•Canon‘s patented
•Variable element shape
•Voltage is applied, changing the shape of the interface
•Obtain the effect of apodization
•Varying refractive power, the Abbe number
•To reduce the time variable aberrations of shape
•By a twist of the material performed, to optimize the absorption coefficient, to suppress the generation of aberration to moderate the curvature of the interface
•To reverse the two materials (such as liquid), the amount of chromatic aberration, do the negation
•Suppress the two materials (such as liquid), refractive index, the difference between the Abbe number
•The entire feeding (with floating)
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發表於 2012-7-17 21:50
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