Canon EOS 5D Mark III Instruction Manual page 84

Lenses and Usable AF Points
Group G
Autofocusing with only 33 points is possible. (Not possible with all 61
AF points.) All of the AF area selection modes are selectable. During
automatic AF point selection, the outer frame marking the AF area
(Area AF frame) will be different from 61-point automatic selection AF.
EF 180mm f/3.5L Macro USM
Group H
Autofocusing is possible only with the AF point at the viewfinder center.
(Autofocusing with multiple AF points is not possible.) Only the following
AF area selection modes are selectable: Single-point AF (Manual
selection) and Single-point Spot AF (Manual selection).
EF 35-105mm f/4.5-5.6
With lenses whose maximum aperture is smaller than f/5.6, AF is not
possible during viewfinder shooting. Also, AF with f is not possible
during Live View shooting and movie shooting.
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: Cross-type AF point. Subject
tracking is superior and high-
precision focusing is achieved.
: AF points sensitive to horizontal
lines.
: Disabled AF points (not displayed).
EF 180mm f/3.5L Macro USM
+ Extender EF 1.4x
: Cross-type AF point. Subject
tracking is superior and high-
precision focusing is achieved.
: Disabled AF points (not displayed).
EF 35-105mm f/4.5-5.6 USM
EF 1200mm f/5.6L USM