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Canon Patent Application: Canon EF 50mm 1.4 with apodization filter
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Canon Patent Application: Canon EF 50mm 1.4 with apodization filter

Canon continues to work on patent applications for the EF mount, a good sign if you are still using the EF mount lenses and camera bodies.

This patent application is for a Canon EF 50mm 1.4 (or perhaps a 55mm 1.4 EF?), and Canon hopes to improve the bokeh with an apodization filter.

Generally, in the medium telephoto imaging lens system from the wide-angle, Sajitaruharo of off-axis light beam causes uneven intensity of defocus image at the image peripheral portion . For this reason, it is possible to improve the appearance of an out-of-focus image in an off-axis light flux by providing the light flux with a transmittance distribution by the apodization filter and effectively removing the sagittal halo. At that time, effective removal of the sagittal halo while suppressing the decrease in light quantity is required as the performance of the apodization filter. 

Focal distance 52.43 
F number 1.49 
Field angle 22.42 
Image height 21.64 
Whole length of the lens 88.51 
BF 39.71 

Japan Patent Application 2019-056780

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