The Nikon D3x is an extreme resolution, professional-grade digital camera. The latest DSLR from Nikon, the D3X is an upgrade from the D3. Building upon the technology of the D3, the D3x offers a number of differences including a CMOS sensor measuring 35.9 x 24.0mm, which captures 24.5 megapixels. With this resolution, the cameras dual CF card slots come into use. Also new with the D3x is an Auto setting for the Automatic Dynamic Range (ADR). Along with the upgrades from the D3, some features of the D3x fail to meet the standard set by the D3. The standard ISO sensitivity of the D3x ranges from 100 to 1600, and expanded ISO ranges from 50 to 6400 (the D3 has a maximum ISO sensitivity of 25,600). Also the continuous high-speed mode yeilds only 5 frames per second (as opposed to the D3's 9 fps). The camera does feature Live View, a 51-point AF (autofocus) system, and a magnesium-alloy body along with the option of recording images as 14-bit (16,384 tones) files.