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Thanks to the joint work of a 3D iToF sensor, the BIONZ X™ for Mobile engine, and the large Exmor RS™ for Mobile sensor, cameras in Xperia phones have faster and more accurate autofocusing in any scene.
The 3D iToF sensor measures the distance between the camera and the object in an instance. It does that by detecting the time difference between the emission of the infrared rays and their return to the sensor after being reflected by the object.
This process helps to get accurate focusing even in low light conditions.