– A commonly used autofocus technology that measures where beams of light from different parts of the lens land on a series of sensors. Seeing where the light falls allows the camera to calculate the position of the lens required to achieve focus on the image sensor. This method is generally faster than contrast detection. Once found only in DSLRs, it s now making its way into mirrorless cameras and even cellphones.tomsguide
A method for detecting the degree of focus using a specialized autofocus sensor.