165Reference13AE Lock EffectsProgram LineAF point selectionMetering methodEvaluative meteringPartial meteringCenter-weighted averageAuto selectionAE lock applied to themetered value at the activeAF point.Manual selectionAE lock applied to themetered value at theselected AF point.AE lock applied to the metered value at the center AFpoint.(when using a mode in the Creative zone)< > The following program line applies when the camera is in Program AE < > mode.Program Line DescriptionThe lower horizontal axis represents the shutter speed, and the right-hand vertical axisrepresents the aperture value. The combinations of shutter speed and aperture valueautomatically determined by Program AE are shown as colored lines with respect to thesubject brightness (Exposure Value) gradations on the left and top edges of the graph.Example: Using an EF50 f/1.4 USM lens with a subject brightness of EV11.5, the point wherethe diagonal line from EV11.5 (on the top edge) intersects the Program AE linerepresents the corresponding shutter speed (1/250 second) and aperture value (f/3.5) that the program sets automatically.The diagonal arrowed lines at the upper left indicate the metering range for eachISO speeds.–1–2–3–41.4–530 15 8 4 2 1 2 4 8 15 30 60 125 250 500 1000 2000 40001.022.845.68111622326 7 8 9 10 11 12 13 14 15 16 17 18 19ISO 1002004008001600H:3200EF24–85mm f/3.5–4.5 USM : WIDE24mmEF24–85mm f/3.5–4.5 USM : TELE85mm2120 2243210EV5EF50mm f/1.4 USMShutter speedAperture value (f/no.)
