The EOS 6D is built around a new Canon CMOS sensor, which offers a pixel count of 20.2MP. In concert with the DIGIC 5+ processor it offers a standard ISO range of 100-25600, expandable down to 50 and up to 102,400. The AF system has 11 points, but only the central one is cross-type (sensitive to both vertical and horizontal detail). However, the 6D's trump card is the ability to focus in extremely low light levels; right down to a claimed -3 EV – a full stop dimmer than the 5D Mark III. This figure might not mean much to you, but for reference, -3 EV is roughly equivalent to the light cast by a full moon.