Camera performance on mobile devices has proven to be one of the features that most end-users aim for. The importance of optical image quality improvement, and the trend to have thinner and thinner smartphones have pushed manufactures to increase the number of cameras in order to provide phones with better zoom, low-light exposure high quality photography, and portrait settings, to name a few. But adding additional lenses to a miniaturized optical configuration and driving light focusing with an electronic device is not as easy as it seems, particularly at small scales or in confined spaces.
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Source: Phys.org