Canon EOS 1 Instruction Manual - Page 40

6. AE Lock The EOS-1 N's evaluative metering system is coupled to the five focusing points. It controls the exposure according to the subject's position, based on the focusing point in use. If you want to determine the exposure independently from the focusing operation, use AE lock. Use it when you also want to change the composition of the picture after determining the exposure. AE lock is effective for backlit subjects and other situations where there is extremely strong contrast between the subject and background. 1 Focus the subject that you want to measure with the camera's metering system. • The exposure values are displayed in the viewfinder and LCD panel. 2 Press the AE lock button ( ). • " " lights in the viewfinder to indicate that the AE lock is set. When you release the AE lock button ( ), the metering timer is activated and the exposure remains locked for six seconds. • Pressing the AE lock button ( ) again renews the locked exposure setting. • AE lock is canceled six seconds after the AE lock indicator ( ) lights in the view finder display, or whenever you press the AF mode selector, metering mode selector, shooting mode selector or focusing point selector. To accurately meter a specific subject area with the AE lock function, we recommend using partial metering or fine spot metering. Place the subject in the center of the viewfinder when activating AE lock. 40