ISO- The sensitivity of the film is governed by the ISO setting. We are able to change the ISO setting on the camera depending on the setting that we’re filing in. ISO 100 is very insensitive to light, but you get a crystal clear image. The higher the ISO it becomes for more sensitive to light, and so less light is needed when filming. If you were to shoot at night, you would want a much higher ISO than if you were shooting on a very bright day. If an image is very ‘grainy’ it is because a low light image has been taken with a high ISO number.
Depth of field if governed by the aperture setting. The aperture is measured in ‘F’. The higher the ‘f number’ the less light Is being let into the lenses, and there for the darker your shot will be. If you wanted a dark exposure, you would use ‘f/2’. A shallow depth of field allows you to focus on something specific and blur out anything out of focus – you would use f/2 for this. However, for a deeper depth of film, you would use a higher f number; f/22. This allows the film maker to change the audiences focus on something specific, in one shot.
Shutter speed is how fast the shutter opens and closes. The shutter is what takes the image. If something moves quickly, and a slow shutter speed is used, the image will be blurry, but if the same image is moving quickly and a quicker shutter speed is used – it will be less blurry and higher quality.
For example: On a bright sunny day, if a photography is taken of a car which is moving very quickly, you would use a fast shutter speed, a high ISO and a low aperture.