Egami, the Japanese photography website has discovered a new Canon patent that can increase dynamic range with a neutral density filter for only half the field of view.
Patent Publication No. 2015-87401 (Google Translated)
- Published 2015.5.7
- Filing date 2013.10.28
- Dual Pixel AF
- And set up a half-ND filter at the pupil position of the lens
- Half ND filter can be switched