The camera angle is measured relative to the subject being filmed and is typically defined only in relative description. The terms used to describe the camera angle are typically low, high, extreme low, extreme high, etc. These refer to the position of the camera, in other words low is lower than standard, high is higher than standard. 

 

To create a low angle, the camera is below the subject being filmed. Since the camera is looking up at the subject, the subject will appear large and seem important or powerful. It can also be used to denote a viewer who is sitting or otherwise lower than the subject of the camera.

 

To create a high angle, the camera is above the subject, looking down. The subject will therefore appear smaller, and less significant. This angle can also imply a viewer who is somehow above the subject of the camera, looking down from a second story, up on a desk, etc. 

 

Standard shot is an eye-level angle. The camera man holds the camera on his shoulder, although this may have to be adjusted slightly if the subject is shorter or taller than the camera man. This is a common angle, and viewers do not perceive anything out of the ordinary because it is the standard way we see the world.