Lekima
New Member

The Nikon D800 is based around a newly-developed FX-format CMOS image sensor with an effective resolution of 36.3-megapixels, a huge step upwards from the 12.1 megapixel chips used in the earlier D700 model. Total resolution of the Nikon-developed sensor, which has dimensions of 35.9 x 24.0 millimeters, is 36.8 megapixels.
In the sensor's native 3:2 aspect ratio, the Nikon D800 outputs images at resolutions up to 7,360 x 4,912 pixels. There are also two cropped 3:2 aspect ratio modes which yield an effective 1.2x or 1.5x (aka DX-format) focal length crop, and a 5:4 aspect ratio mode which uses the full height of the image sensor, but trims the sides.
In all modes, there are three resolution options available. In 3:2 aspect ratio, medium resolution equates to 20.3 megapixels, and even the lowest-resolution mode works out to about 9.0 megapixels--surprisingly close to the full resolution of the D700.