Canon EOS-1Ds Mark III EOS-1Ds Mark III Instruction Manual - Page 189
Program Line
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Program Line The following program line applies when the camera is in Program AE mode. ISO 1002004080010600 Aperture 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 32 4 22 3 16 2 11 1 0 8 5.6 -1 4 -2 2.8 -3 -4 2 1.4 -5 EV 1.0 30 15 8 4 2 1 2 4 8 15 30 60 125 250 500 1000 2000 4000 8000 Shutter speed 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