Exposure / Learn by doing
Auto ISO explained simply
What is “Auto ISO”?
A setting that lets the camera choose ISO within limits you set or the camera provides.
- 01Set limits
- 02Light changes
- 03Inspect chosen ISO
How do you use Auto ISO practically?
A small exercise
Set a sensible ISO limit and minimum shutter speed where available. Photograph a person walking from a bright area into shade.
- Make a starting version and keep it so you can compare fairly.
- Try the change in the exercise. Keep unrelated choices steady where the exercise allows.
- Compare the result at the size your viewer will actually see. Write down what changed and whether it helped.
How does Auto ISO solve a problem?
It helps maintain a usable shutter speed as the light changes without adjusting ISO for every frame.
What can go wrong?
At its maximum ISO, the camera may still give a dark exposure or a slower shutter. Learn the behaviour of your mode.
How do you turn the idea into a useful solution?
Start with the specific problem in your image or brief, try the exercise, and keep the version that meets that need. If the result is worse, return to the starting version and change one choice at a time.
Quick check: can you explain the three ideas in the diagram?
Set limits → Light changes → Inspect chosen ISO. Explain how each relates to the exercise. Then compare the starting version with your result and choose the one that meets your brief.
Related video lesson
Exposure controls — Canon
This related lesson gives wider context for the topic. Camera menus and software versions may differ from yours.
Loading the player connects to YouTube. You can also watch the lesson on YouTube.Keep exploring
Try the idea in a studio shoot
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