The posts below intend to share an experience, a technique or an idea regarding photography. However, I a changing the adress of my website: the new site is http://phosics.tk
When taking photographs of a dim-lit scene, you could think that choosing the smallest ISO setting on your camera will help with reducing the overall noise of the picture. What matters for real however, is the total number of counts that the sensor has recorded. You cannot change how much light will reach the sensor for a given exposure time and aperture setting, but you can change the way the sensor will count them. This is done precisely by the ISO setting, and finding the range where the handling of the signal is best is an easy procedure.