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When you push the shutter, all pixels of the camera become active and begin absorbing light while the shutter is open. This allows for high quality and non-grainy pictures. The live preview shown on cameras is only a very low quality preview for a small screen so you know what you are pointing the camera at.

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Q: Given that the image is already visible on the screen on the back of my digital camera what is the sequence of events in the camera when you push the shutter?
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