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 camera's AF sensors require some details in the image to determine the phase difference. It's harder for the camera to find focus when the light is dim or there is little subject detail.

相机的自动对焦感应点需要一些影像细节来确定相位差，光线不足或者物体细节不足都会导致聚焦困难。

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An optical apparatus is disclosed which can reliably form AF images and split the AF images to provide excellent focus detection performance in the phase difference detection method.

公开了一种光学装置，该光学装置在相位差检测方法中能可靠地形成AF像并分离该AF像以提供优良的焦点检测性能。

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The F900EXR uses its EXR-CMOS II sensor to shoot video full HD at a smooth 60 frames per second with improved Phase Detection AF with superior color reproduction.

ENGADGET: Fujifilm launches alphabet soup of point-and-shoot, compact and bridge cameras

The F900EXR automatically switches between Phase Detection AF and Contrast Detection AF depending on the subject and scene, guaranteeing superb ease-of-use and fast, accurate autofocus no matter what the setting or shooting conditions.

ENGADGET: Fujifilm launches alphabet soup of point-and-shoot, compact and bridge cameras

Even the advanced two-stage focusing system has made its way from the T4i, which utilizes both phase-difference and contrast AF in order to achieve focus more efficiently when capturing video.

ENGADGET: Canon EOS M mirrorless camera hands-on (video) Hands-on