There was a time when smartphone makers rushed to quad-camera claims, most of which did so by throwing in a mediocre fourth camera — usually for macro shots, if not a monochrome filter or just a depth ...

Most mobile phones set the 23 - 27mm focal length to 1x (1.0x). Thus, the super wide-angle is 0.4x, 0.5x, 0.6x, and the medium telephoto is 2.0x, 3.0x, 5.0x... But this brings about two basic ...

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