High Quality Content by WIKIPEDIA articles! The Nikon D5100 is a 16.2 megapixel DX format DSLR F-mount camera announced by Nikon on April 5, 2011. It features the same 16.2-megapixel CMOS sensor as the D7000 with 14-bit resolution, while delivering Full HD 1080p video mode with up to 30fps. It replaces the D5000.