Exmor is the name of a technology Sony implemented on some of their CMOS image sensors. It performs on-chip analogue/digital signal conversion and two-step noise reduction in parallel on each column of the CMOS sensor. It can help to reduce the amount of "seen" pixels when you're zoomed in on a photo.
Exmor should not be confused with Exmor R, Sony's trade name for backside illuminated sensor technology, which is restricted solely to small, high-density sensors for compact cameras, cellphones, etc. Unlike Exmor R, Exmor is not limited to use in smaller sensors, and its benefits are just as applicable in the larger APS-C sized sensors featured in DSLRs.
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