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Actually, software controls the shutter, the lens aperture, and the image sensor too.
Software in a digiital camera is activated as soon as you power up the camera. Even when the camera is just sitting there turned on, the camera software is running an 'idle loop' that watches for an interrupt (a pressed button, or moved switch).
Software in a digiital camera is activated as soon as you power up the camera. Even when the camera is just sitting there turned on, the camera software is running an 'idle loop' that watches for an interrupt (a pressed button, or moved switch).