If you've ever switched your camera from stills to video mode with Log enabled, you may have noticed that it seems you can no longer use the base ISO setting. But shooting video in Log doesn't arbitrarily force you to shoot at higher ISO, despite what the camera's settings might suggest.

In a two-part video explainer totaling less than two minutes, DPReview’s Richard Butler succinctly breaks down why ISO isn't quite what it seems in Log. In part one, which you can watch at the top of the article, Richard briefly walks through some of the very basics of ISO. Part two (the video below) gets into the details of why Log is different, and how that impacts ISO.

The videos do a great job of simplifying a complex topic, so be sure to give them both a watch. Should you want something more in-depth, you can read Richard's articles about what ISO is and what makes it so complex.