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Canon Patent Application: Apodization Lenses for EF and RF
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Canon Patent Application: Apodization Lenses for EF and RF

This patent application contains a series of embodiments for both EF and RF mount systems. 

It sounds like this patent application deals when using an apodization filter and maintaining an even uniformity of light at different wavelengths - which translates to me as being no color cast when using an apodization filter. In the above diagram, surface areas (10) have the layers added for the apodization effect.

The patent covers a few lens embodiments as listed below.

Canon EF 50mm F1.4

focal length          52.13
F number               1.45
Angle [degree]        22.54
Image height          21.64
Lens total length     85.51
BF                    37.71

Canon EF 24mm F1.4

Focal length          24.55
F number               1.45
Angle [degree]        41.39
Image height          21.64
Lens total length    119.13
BF                    38.01

Canon RF 130mm F1.4

focal length         131.00
F number               1.41
Angle [degree]         9.38
Image height          21.64
Lens total length    182.28
BF                    13.87

Japan Patent Application  2021-196547

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How to view Japan Patent applications.

Unfortunately, there's no direct way of linking to the patent application (sad!) however, this is the easiest process to view a japan patent or application.

  1. Go to the Japan Patent Office search page.
  2. If it's a patent application (they are usually in the format of Year-Number ie: 2017-011300) then type the patent application number into the second field down from the top where it says publication of patent application. 
  3. Click on search.
  4. Then click on the patent application number link, and there's the patent application!

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