Canon patent application 2018-97240 (in Japan) describes a 58mm f/1.4 lens for full frame cameras with adjustable soft focus.
- Focal length: 57.58mm
- F number: 1.43
- Half angle of view: 20.60
- Image height: 21.64mm
- Lens length: 160.04mm
- Back focus: 40.43mm
The patent describes:
[…] an optical system containing the 1st focus group and the 2nd focus group which move by each other different locus on the occasion of focusing,
An arrangement state of the aforementioned optical system,
An optical system comprising:
A first arrangement state by which said 1st focus group and said 2nd focus group are arranged so that it will be in a focusing state in the predetermined object distance and a first aberration amount may be generated.
A second arrangement state by which said 1st focus group and said 2nd focus group are arranged so that a second aberration amount which will be in a focusing state in the aforementioned predetermined object distance, and is different from said first aberration amount may be generated.
More Canon patent applications are listed here.
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