ISO
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The ISO setting affects the imaging sensor’s sensitivity to light. The higher the number, the less light that is required to properly expose the image sensor. You can either have the camera automatically choose the sensitivity, or you can set it manually.
It’s a good idea to set the ISO speed to suit the ambient light setting that you’re shooting in. When you increase the ISO speed (a higher number) for low light, a faster shutter speed can be used to avoid camera shake.
Set the ISO speed by pressing and holding the ISO button and while looking at the control panel and turn the main command dial to set the desired ISO speed.
Keep in mind that a higher ISO setting will introduce noise or grain into your images. An ISO setting that is too high for the shooting conditions will make the image lose quality, and you might even start to see particles in your picture.
These assignments will help you experiment with ISO settings to become more familiar with their range and control. The image sensor on your camera is very powerful—it gives you the flexibility to shoot in low-light conditions and still get amazing pictures.
Assignments
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Just like shutter speed and aperture it is important to experiment with different settings. First, take a picture with intentional noise. To do this, select a very high ISO. You will notice a low quality image that seems to be pixilated.