Canon patent to increase dynamic range with use of Neutral Density filter (using Dual Pixel AF)


Canon filed  patent to increase dynamic range by using a Neutral Density (ND) filter on half of the measured field. This is a pretty complex one and I am not 100% sure I got it right (any help welcome).

The described system works by getting different degrees of light intensity from the Dual Pixel auto-focus (DPAF) points (i.e. split pixels) on the sensor. The patent says the ND filter is placed on 50% of the measured field: different amounts of light hit the split AF pixels needed for DPAF (this means both of the split pixels are used to measure the DR). The result is an output that’s able to render an increased dynamic range to the sensor, and a easier to measure differential signal from the DPAF points. It is not as easy as I am trying to put it :-) To learn more about Canon’s Dual Pixel Auto-Focus technology have a look here.

  • Patent Publication No. 2015-87401
    • Published 2015.5.7
    • Filing date 2013.10.28
  • Canon patents
    • Dual Pixel AF
    • And set up a half-ND filter at the pupil position of the lens
    • Half ND filter can be switched
[via Egami]

Canon patent for camera system with translucent mirror and EVF


Canon filed a patent for a camera system with translucent mirror and electronic viewfinder (EVF). Looks like a patent for a technology similar to Sony’s translucent mirror. This is not the first time Canon files a patent referring to a translucent mirror (1 | 2).

  • Patent Publication No. 2015-97352
    • Published 2015.5.21
    • Filing date 2013.11.15
  • Canon patents
    • Half mirror and the optical path division by
    • One of the light beam received by the image pickup device
    • The other light flux I receive in AF sensor
    • FPS of the AF sensor, faster than the image pickup device
    • Pixel area of ​​the AF sensor is larger than the image pickup device
    • From the AF sensor and the image sensor to obtain an image to be displayed on the EVF or back display

What’s coming next from Canon’s labs?

[via Egami]