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With a 35mm camera, the shutter-release button is pressed down in a single step. However, it’s a two step process when shooting with a digicam. When the shutter-release button is depressed half-way, both exposure and focus are locked as long as you hold it in that position.
How will you know when focus and exposure are locked? An indicator on the LCD or a light on the camera near the viewfinder will glow steadily to confirm the lock. If the light blinks, you’ll have to try again. Once the camera confirms focus and exposure, then fully depress the shutter button.