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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