Bob Atkins
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I'm sure the technology used in the T4i sensor will also be used in the sensor for any mirrorless camera. It's tough to say if Canon will go the APS-C route and use the T4i sensor or if they'll make a smaller version which would enable them to make a smaller camera and launch a line of smaller lenses. From a purely economic viewpoint they might get more revenue from a smaller sensor needing a new set of lenses, though they could also make a new set of lenses for an APS-C mirrorless camera too. Sony (APS-C) and Olympus (4/3) went with the same sensors they used on their DSLRs, while Nikon went the other way and made a smaller camera. Both schemes have their merits for a sales perspective.
The phase sensitive AF zones on the T4i are "assist" AF sensors. They tell the camera which way to focus and about how much to focus, though as I understand it the final focusing is done using the sensor pixels in a contrast detection mode. That's why it's slower then the Nikon 1 system which I think is phase sensitive all the way, just like a regular DSLR.
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