Canon EOS 1D Software Instruction Manual page 193

Enables automatic shooting when focus is achieved at the
fixed point of focus while the shutter button is pressed fully
This takes the picture automatically when the subject comes to the preset focusing distance.
Focusing detection is performed using the selected AF point.
Set the lens focus mode switch to <MF> and focus manually at the desired point of focus.
Keep pressing the shutter button fully.
Using an accessory like Remote Controller RS-80N3 which can lock the shutter button
relieves you from holding down the shutter button while you wait for the subject.
Because the camera remains on standby while the shutter button is fully pressed,
battery power is used up more quickly. For long periods of photography, use the DC
Coupler Kit.
When this function is used in combination with a flash, the flash remains on standby
at full charge. Consequently, the flash batteries are used up more quickly. (The
Speedlite's SE mode is disabled.)
When you use a flash with this function, set the drive mode to single-frame shooting.
If you select continuous shooting, the flash will be unable to charge in time for
successive shots and will not fire at full charge.
If you set the drive mode to continuous shooting, set the number of shots in P.Fn-20.
If you do not use P.Fn-20, once the camera focuses on the subject, continuous
shooting will continue until the capacity of the memory card is reached.
P.Fn-16 cannot be used with manual focus lenses or with lenses that are too slow to
be used with autofocusing.
Do not use this function when C.Fn-4-1/3 is set as shots will be taken regardless of
whether the image is in focus.
Using an accessory like Remote Controller RS-80N3 which can lock the shutter button is
recommended.
Disables automatic AF point selection
When you select beyond the peripheral AF point, the selection stops there. It makes
selecting a peripheral AF point faster.
If C.Fn-11-2 has been set, you can switch to automatic AF point selection by pressing
the < > button during autofocusing. (
Instruction Manual)
If automatic AF point selection has been preset at [AF frame registration] setting, the
preset setting remains valid. (
camera's Instruction Manual)
"Selecting the AF Point" in the camera's
"Registering and Switching the AF Point" in the
Personal Function Settings
M-69
M
4