Nikon D40 manual Autoexposure Lock, Reference P, S, A, and M Modes/Exposure, Mode Setting, AE Lock

Autoexposure Lock

Controls used AE-L/AF-L button

If the subject is not in the metered area when center-weighted or spot metering is used, exposure will be based on lighting conditions in the background and the main subject may not be correctly exposed. This can be prevented by using autoexposure lock.

1Select mode P, S, or A and choose center-weighted or spot metering (exposure lock has no effect in mode M).

2Position the subject in the selected focus area (when using center-weighted metering, position the subject in the center

focus area). Press the shutter-release button halfway and con- firm that the in-focus indicator (z) appears in the viewfinder. Then, keeping the shutter-release button pressed halfway and the subject positioned in the selected focus area, press the AE- L/AF-L button to lock exposure.

While exposure lock is in effect, an EL indicator will appear in the viewfinder.

3Keeping the AE-L/AF-L button pressed, recompose the photo- graph and shoot.

Adjusting Shutter Speed and Aperture

While exposure lock is in effect, the following settings can be adjusted without altering the metered value for exposure.

Mode	Setting
Programmed auto	Shutter speed and aperture (flexible program; 40)
Shutter-priority auto	Shutter speed
Aperture-priority auto	Aperture

The new values can be confirmed in the viewfinder and shooting information display. Note that the metering method can not be changed while exposure lock is in effect (changes to metering take effect when the lock is released).

12—AE-L/AF-L ( 77)

This option controls the behavior of the AE-L/AF-L button.

13—AE Lock ( 77)

This option controls whether the shutter-release button locks exposure.

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Reference: P, S, A, and M Modes/Exposure