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The following program line applies when the camera is in Program AE
<d> mode.
Understanding the Program Line
The lower horizontal axis represents the shutter speed, and the right-hand
vertical axis represents the aperture.
The combinations of shutter speed and aperture automatically determined by
Program AE are shown as lines with respect to the subject brightness
(Exposure Value) levels on the left and top edges of the graph.
Using an EF50mm f/1.4 USM lens with a subject brightness of EV12, the point
where the diagonal line from EV12 (on the top edge) intersects the Program AE
line represents the corresponding shutter speed (1/320 sec.) and aperture
(f/3.5) that the program sets automatically. The diagonal arrowed lines at the
upper left indicate the metering range for each ISO speeds.
Program Line
ISO 100
200
400
800
1600
-1
-2
-3
-4
1.4
-5
30 15 8 4 2 1 2 4 8 15 30 60 125 250 500
1000 2000 4000 8000
1.0
2
2.8
4
5.6
8
11
16
22
32
11 12 13 14 15 166 7 8 9 10 17 18 19
21 2320 22
4
3
2
1
0
EV
5
Shutter speed
Aperture
COPY