Program Line

The following program line applies when the camera is in Program AE <d> mode.

 

100

 

 

ISO

200

 

 

400

 

 

 

800

 

 

 

1600

5 4 3 2 1 0 -1 -2 -3 -4

-5

EV

6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23

 

 

 

 

 

 

 

 

 

 

 

 

32

 

 

COPY

22

 

 

16

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

11

 

 

 

 

 

 

 

 

 

 

 

 

8

 

 

 

 

 

 

 

 

 

 

 

 

5.6

 

 

 

 

 

 

 

 

 

 

 

 

4

 

 

 

 

 

 

 

 

 

 

 

 

2.8

 

 

 

 

 

 

 

 

 

 

 

 

2

 

 

 

 

 

 

 

 

 

 

 

 

1.4

30

15

8

4

2

1

2

4

8

15

30

60

1.0

125 250 500 1000 2000 4000 8000

Shutter speed

Aperture

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.

189