Canon EOS 5D Mark III Instruction Manual (en)

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Lenses and Usable AF Points
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.
: 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).
Only the AF point at the center of the viewfinder, and the surrounding 
AF points (above, below, on the right and on the left) can be used for 
autofocusing. Only the following AF area selection modes are 
selectable: Single-point AF (Manual selection), Single-point Spot AF 
(Manual selection), and AF point expansion (Manual selection
 
).
: Cross-type AF point. Subject 
tracking is superior and high-
precision focusing is achieved.
: AF points sensitive to horizontal lines 
(on the right and on the left of the 
center AF point) or vertical lines 
(above and under the center AF 
point). Manual selection is not 
possible. Only available when “AF 
point expansion (Manual selection 
 
)” is selected.
: Disabled AF points (not displayed).
Group G
EF180mm f/3.5L Macro USM
EF180mm f/3.5L Macro USM 
+ Extender EF1.4x
EF1200mm f/5.6L USM
Group H
EF35-105mm f/4.5-5.6
EF35-105mm f/4.5-5.6 USM