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In the digital world it makes more sense to measure how many pixels of sensor correspond to a given physical size (which is easy to measure by shooting a ruler as close as possible): On my APS-C camera a "macro" lens with the 1:1 ratio covers a 22mm field of view with 5472 pixels, so this is about 249 pixels/mm. On my phone, using the 48Mpix mode, the ...

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