For the purposes of this website, we'll call "proper" exposure the amount of light that will give you the results you want. It is not what your camera's light meter says is the right amount of light, and it is not the amount of light that will duplicate what you see in the scene. After all, you may have good reason to expose your photograph to make it look different from reality. Proper exposure is what gives you the results you want.
Exposure is controlled by three factors:
- Shutter Seed: Shutter speed is the amount of time your sensor is exposed to light. In our bucket analogy, it is the length of time that the faucet is turned on. The longer the faucet is on, the more the bucket will be filled.
- Aperture: Aperture is the size of the lens opening that allows light to fall on the camera's sensor. In our bucket analogy, it is the width of the opening of the faucet. The larger the opening, the faster water can flow into the bucket.
- ISO: ISO is a measurement of the speed that the sensor records light. In our bucket analogy, it is like the water pressure of the faucet. The greater the water pressure, the faster the bucket will be filled.