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Canon’s Rebel T4i Pixel-Level AF Sensors; Mirrorless Next?

July 8, 2012 By Eric Reagan

Rebel T4i

The Rebel T4i is the first Canon DSLR to feature full-time AF in video mode.  The past Canon DSLRs have featured the ability to force an AF confirmation using a slow and clunky contrast-detect method, which was simply unusable during video capture.  Another AF confirmation option has been to use the cameras’ phase detection sensors; however, this caused a blackout during live view thanks to the mirror flipping down in front of the image sensor.

The folks over at Chipworks [via Image Sensors World] tore down a Rebel T4i to get a look at the image sensor and reveal phase detection sensors mixed among the pixels.  This is something that Canon has been cooking on for a while. (Note this patent application that I discussed back in 2010.)

Chipworks Cano Rebel 4i pixel-array-ir

And while we’ve seen this concept implemented in prior cameras (notably the Fuji F300EXR point and shoot camera and Nikon 1 Series), Canon has gone about it in a technically different way to make it effective for DSLRs. [Read more…]

Filed Under: Canon Tagged With: Canon, dslr, phase detection, phase-difference, Rebel T4i

 

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