« on: January 16, 2014, 06:17:45 PM »
It's great to hear that your 6d is working fine, but imho unless your 6d has another sensor array this simply means you're lucky (or didn't look @100% crops) - with wider apertures, the 6d af is f2.8 non-cross and falls back to f5.6.
Seems to me the center-AF point is always cross-type as long as the max. aperture is wider than f/5.6.
From the 6D manual:
Maximum lens aperture: f/3.2 - f/5.6
Cross-type focusing (vertical and horizontal lines detected simultaneously) is possible with the center AF point. The other AF points are either vertical- or horizontal-line sensitive.
Maximum lens aperture: f/1.0 - f/2.8
Besides cross-type focusing (vertical and horizontal lines detected simultaneously), the center AF point can also perform high-precision, vertical-line sensitive AF. The other AF points are either vertical- or horizontal-line sensitive.