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[* black] The D5100 utilizes a 16.2 megapixel [link|http://en.wikipedia.org/wiki/Nikon_DX_format|DX format] CMOS sensor to capture images.
[* icon_note] This sensor has the same specs of the sensor used by the [link|http://en.wikipedia.org/wiki/D7000|Nikon D7000].
[* black] [link|http://www.chipworks.com/en/technical-competitive-analysis/resources/recent-teardowns/2011/01/teardown-of-the-nikon-d7000-dslr/|Chipworks] reports that each pixel is 4.8 µm wide. That's about half the diameter of a red blood cell!
+[* black] The sensor has a special glass cover that turns red when viewed at an angle. Neat!