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One of the main advantages of a DSLR camera is the ability to adjust aperture, the amount of light that the lens lets through. Small apertures put a majority of the shot in focus, while wide apertures focus on specific parts of the composition. Depth of field, the amount of sharp focus in an image, can be tricky to manipulate with a smartphone camera. The aperture of most smartphones is fixed on a wide depth of field, which is useful for taking photos on-the-fly, yet not nearly as convenient as the settings of a professional camera.

через Experimenting with Depth of Field in Mobile Photography – Enlight Leak