Canon EOS 1D Software Instruction Manual page 191

Retains the shift amount for program shift
Normally, any program shift amount is canceled after you take the picture. This Personal
Function retains the program shift amount.
This function is useful when you want to shift the standard program line so that priority is
given to the shutter speed or to the aperture.
By shifting the program, you can change the shutter speed or aperture and still retain the same
exposure level. Under the same brightness, you can shift the program line toward the right to
set a faster shutter speed and a larger aperture (lower f/number). Or you can shift the program
line toward the left to set a slower shutter speed and a smaller aperture (higher f/number).
P.Fn-10 retains the amount of program shift. Select the appropriate amount of shift for the level
of priority you want to give to the shutter speed or aperture setting.
Darker
5 6 7 8 9
4
3
2
1
0
-1
-2
-3
-4
-5
30 15 8 4 2
Standard program line
Program line shifted toward a faster shutter speed.
Program line shifted toward a slower shutter speed.
The program shift amount remains in effect until you set it back to the standard program
manually or replace the battery or press the CLEAR button (QUALITY+WB).
The shift amount is retained even after you change the lens.
Brightness (EV at ISO100)
10 11 12 13 14 15 16
1 2 4 8 15 30
With EF50mm f/1.4 USM lens
Personal Function Settings
Brighter
17 18 19 20 21 22
60 125 250 500 1000 2000 4000
Shutter Speed
M
Aperture
23
32
22
16
11
8 4
5.6
4
2.8
2
1.4
1.0
8000
M-67