C.fn Iii: Auto Focus/Drive; Ai Servo Tracking Sensitivity - Canon EOS 1D Instruction Manual

3 Custom Function Settings

C.Fn III: Auto focus/Drive

C.Fn III -1
USM lens electronic MF can be enabled or disabled for when you use any
of the following lenses.
EF50mm f/1.0L USM, EF85mm f/1.2L USM, EF85mm f/1.2L II USM,
EF200mm f/1.8L USM, EF300mm f/2.8L USM, EF400mm f/2.8L USM,
EF400mm f/2.8L II USM, EF500mm f/4.5L USM, EF600mm f/4L USM,
EF1200mm f/5.6L USM, or EF28-80mm f/2.8-4L USM
0: Enable after One-Shot AF
After focus is achieved in One-Shot AF, electronic MF is enabled. If C.Fn
IV -1-2, 3 is set, it is also enabled before focus is achieved.
1: Disable after One-Shot AF
After focus is achieved in One-Shot AF, electronic MF is disabled. If
C.Fn IV -1-2, 3 is set, it is possible before focus is achieved.
2: Disable in AF mode
Electronic MF is disabled in the AF mode.
C.Fn III -2
During focusing in the AI Servo AF mode, the AF sensitivity for tracking
subjects (or obstacles) moving into AF points can be set to one of five
levels.
If it is set toward [Slow], interruptions by any obstacles will be less
disruptive. It makes it easier to keep tracking the target subject.
If it is set toward [Fast], it will be easier to focus any subjects which
suddenly enter the picture from the side. Convenient when you want to
successively photograph multiple subjects located at random distances.
C.Fn III -3
For the AI Servo AF and continuous shooting modes, you can change the
Servo's operation characteristics and shutter-release timing.
0: AF priority/Tracking priority
For the first shot, focusing the subject is given priority. For the 2nd and
following shots during continuous shooting, focus-tracking of the subject
is given priority.
166
USM lens electronic MF

AI Servo tracking sensitivity

AI Servo 1st/2nd image priority