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What Is ISO Speed?

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Description

People often ignore ISO because they don't fully understand what it does, but once you do, you'll be making use of this clever tool all the time - and not only in low light conditions.

ISO is a kid of bonus exposure control which can help you out of all sorts of tricky situations.

In this video we'll explain

  • ISO introduction
  • How ISO works
  • ISO range and shooting in low light
  • Grain and noise
  • When to use ISO rather than flash

Instead of using flash for this indoor portrait I increased the ISO speed to make the camera more sensitive to light. Why would I not use flash?

Small on camera flashes have a nasty harsh look to the lighting which looks so stark and unflattering. Watch the video and you'll see what I mean. As far as I'm concerned ISO speed is king.

Don't miss our Using ISO speed films...

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