Canon Patent: 135mm f/2, 400mm f/4 and 50mm f/2.5 defocus smoothing

New Canon Patent applications filed for a set of RF mount lenses with electronically controlled Defocus Smoothing (DS).

Defocus Smoothing is a technology Canon first introduced with the RF 85mm f/1.2L DS lens. The featured Canon patent might suggest more DS lenses are on their way.

Canon patent application 2020-199390 (Japan) discusses optical formulas and methods for three prime lenses with DS:

  • 135mm f/2
  • 400mm f/4
  • 50mm f/2.5

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