D90 is a single-lens reflex digital camera. It has an image sensor of 23.6 x 15.8 mm CMOS sensor (Nikon DX format) and effective pixels of 12.9 million. It has the world's first D-SLR movie function: D-Movie, available in 320 x 216 pixels, 640 x 424 pixels or 1,280 x 720 pixels in AVI format.