Tricking Your Camera's Autoexposure Eye

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Tricking Your Camera's Autoexposure Eye

 When you take a picture in automatic exposure mode, most digital cameras lock in exposure when you depress the shutter button halfway. So, you can force a darker exposure by pointing the camera at an object that's lighter than your actual subject when you lock in the exposure. If you want a brighter exposure, lock in exposure on an object that's darker than your subject. After locking in exposure, reframe the picture without taking your finger off the shutter button and then press the button the rest of the way down to take the picture.

Don't forget, however, that the camera also sets focus when you depress the shutter button halfway, so make sure that the object you use to lock in exposure is approximately the same distance from the camera as your subject.

Source: Dummies.com