Canon EOS-1DS Mark III Instruction Manual page 81

Setting the AF and
Drive Modes
The Area AF has 45 AF points
(19 high-precision crossRype
points and 26 Assist AF points).
You can select any one of the 19
cross-type points to match your
composition.
You can also select the AF mode to match the shooting
conditions and subject and select the best drive mode.
_AF> stands _ or auto _0cus: <_'IF> Stands formanua_ focus.