Gain / ISO

1. What does the ISO/Gain sensitivity of a camera mean?
2. Why would you want to increase the ISO/Gain of the camera?
3. What happens when you increase the ISO/Gain on a camera? What are the problems that come into play?

The ISO/Gain sensitivity of the camera refers to the amount of light that is artificially increased. Each individual sensors determine the amount of each color is can detect. The sensor then translates this information to display a specific color. In cases where light is preferred over less noise, the camera operator may consider increasing the ISO. In better cameras, the ISO can increase the noise by a lesser degree, however, it will inevitably increase the visual noise. The quality of the ISO/Gain is determined by the amount of signal interference one is able to avoid.