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Depth of field is important in photography because it adds drama to photos and draws attention to a subject. Typically this effect is achieved with good old fashion SLR cameras, but manufacturers have found a way to bring it over to mobile as well. You have your Nokia Refocus app, the HTC One (M8) Duo camera, and most recently Google’s standalone Camera app, which came equipped with a feature known as Lens Blur. They all promise the same thing, but which one is the best? We performed a few simple tests to find out.