Many modern cameras offer an Exposure Index (EI) mode for changing exposure, instead of the simple gain that we had in the past. Other cameras offer both ISO and Gain adjustments that relate to one another, but exactly how is not always clear. With all of these options, I often get questions about the differences between ISO, Gain and EI and how they can affect each other. A little while ago, I wrote a help desk article for HD Video Pro magazine in which I talk about all of these modes and how they work in different cameras. You can read the full article over on HD Video Pro’s website – Help Desk: Sense & Sensitivity.