Canon has filed a patent for an EF 135mm f/2L optical formula 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.
Patent publication number 2016-218444 (Google Translate)
- 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
We have not heard anything regarding a new EF 135mm f/2L lens coming in 2017, but we'll obviously let you know if we do.