Camera Controls Depth of Field

Camera Controls Exposure Apature, Shutter Speed & ISO

This picture shows the relationship between the apature and shutter speed. This is important as the right settings will give the the correct or desired exposure. 

Apature - this is mesured in f/stops.

The smaller the number the bigger the opening, this lets more light into the lens.

The bigger the number the the smaller the opening, this lets less light into the lens.

Shutter Speed - this is the amount of time the shutter is open for.

The longer the shutter is open the more light is let in, this also causes the motion blur.

The faster the shutter speed the less light is let in, this creates a sharper picture.

You will need to balance these two settings to achieve the desired result.

Adding to this there is an ISO setting that helps with achieving the correct exposure.
This ISO is how sensitive the light sensor is to the light in the scene.

The higher the number the more sensitive it will be. This can help add light to your picture however it has its down fall. The higher the number to more digital noise will appear in your image.