Even with five, six, seven million pixels of resolution, palm-of-your-hand digital cameras produce disappointingly blurry results in low light. It´s nigh impossible to hold the camera steady during those long exposures. Boosting the sensitivity of the image sensor (ISO) so it can gather more light hasn´t worked, because that entails running more electricity through the sensor, which registers the current as light. This creates a pockmarked trail of incorrectly “exposed” pixels and gives you a dark and “noisy,” or grainy, image.