Canon has filed a new patent for 135mm f/2 lens with apodization filters.
Apodization is an optical filtering technique, and its literal translation is “removing the foot”. It is the technical term for changing the shape of a mathematical function, an electrical signal, an optical transmission or a mechanical structure. In optics, it is primarily used to remove Airy disks caused by diffraction around an intensity peak, improving the focus.
Take a look at the patent details below (translated by Google):
- Release date 2016.12.22
- Application date 2015.5.20
- Focal length 130.98
- F number 2.06
- Field of View 9.38
- Image height 21.64
- Lens total length 159.05
- BF 53.99
- Even when there is vignetting, a good blurred image at all angle of view