ISO

 

ISO

ISO is the measure of your camera sensor’s sensitivity to light. The lower the number the finer the noise, or grain, in your photo. The higher the number, the more noise you’ll see in your images.

Not all scenes are well lit and will require you to bump up your ISO in order to take a good exposure. Bright sunny days may allow you to set your ISO at the lowest number, usually 100 ISO. Whereas shooting just after sunset or at night when it’s dark may require an ISO level of 800 to 1600 or more.