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| p.1 #5 · f2.8 and Canon 5d Mark III Autofocus |
From the first link in my previous post (on page three of the link):
Rudy Winston wrote:
Twenty-one Cross-type AF points, with any lens f/5.6 or faster
The central 21 AF points in the EOS-1D X (and 5D3) provide cross-type coverage, with separate horizontal and vertical line sensors, regardless of the lens in use (as long as the lens – or lens plus tele extender combination, if applicable – has a maximum aperture of f/5.6 or faster). This is especially useful to pros and serious enthusiasts who prefer to use central AF points. And, it extends beyond the center-most AF point, as indicated on the adjacent diagram. Any and all of these points provide cross-type AF coverage, even with lenses such as the EF 100-400mm f/4.5-5.6L IS, or the EF 800mm f/5.6L IS.
The central five AF points: cross-type and...Show more →
But, users should also be aware that there are some special attributes of the central five AF points – that is, the center-most point, and the two AF points directly above and below it. This is completely in addition to the cross-type central AF points with f/5.6 lenses just mentioned above.
This vertical row of points also has a completely separate set of high-precision AF line sensors. They combine true high-precision (the highest ever in an EOS AF system), along with a diagonal cross-type layout of the AF points. If you could see them, they'd appear more like a letter "X" than...Show more →