Traditionally, phase detection in DSLRs has been conducted by a dedicated AF sensor.

传统上，数码单反相机使用一个单独的对焦感应器进行相位侦测。

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The Multi-CAM 4800 DX AF sensor works in tandem with the Scene Recognition System to accurately acquire and track subjects throughout the frame.

ENGADGET: Nikon D5200 to reach US photographers in late January for $900

To support the ample sensitivity of the new camera's sensor, the EOS 6D camera's Auto Focus (AF) system includes a newly-developed 11-point AF sensor featuring a high-precision center cross-type point with an exceptional EV -3 sensitivity rating for accurate focusing even in extremely low-light conditions.

ENGADGET: Canon unveils EOS 6D DSLR: full frame sensor and WiFi for $2,099 in December

The Nikon D5200 shares an AF system, metering sensor and scene recognition with the Nikon D7000 series, giving this camera a new level of performance and much enhanced image quality.

ENGADGET: Nikon reveals D5200 SLR with D7000-taunting specs: 24MP sensor, 39-point AF, wireless port (hands-on)