Did you get your shutter speed down? Are you a professional with adjusting your shutter speed, and getting the perfect shot?
If you are, then you can start playing around with your ISO settings on your camera. If you do not have your shutter speed down pat, then back to the books, or else from personal experience, the ISO setting will be hard to comprehend.
The ISO measures the sensitivity of the image sensor. It is measured in numbers on your camera (100, 200, 400, 800, etc.). The lower the numbers are the less sensitive it is to light, which means the finer the grain is! If you chose a higher number the more sensitive it is to light, which means the larger the grain is.
The Digital Photography School shows ISO well when this picture is shown.
Auto mode on your camera will also adjust the ISO setting automatically depending on the situation you are shooting in. Higher ISO settings are typically used with indoor sports (subject is moving fast with limited light), concerts (low light & no flash zones), and birthday parties (blowing out candles in a dark room).
Aristotle once said, “For the things we have to learn before we can do them, we learn by doing them.”
So are you ready to take the wise words of Aristotle and start playing around with your ISO setting by experimentation? I know I am… On your marks, get set, GO!