Camera Parts

Aperture:  is an opening, hole, or gap.

Shutter:  is a device that opens and closes to expose the film in a camera.

Depth of field:  is the distance between the nearest and the furthest objects that give an image to be focused in a camera 

F-stop:  The f/stop regulates how much light is allowed through the lens by varying the area of the hole the light comes through. 

Focus length: the distance between the center of a lens or curved mirror and its focus