aperture- An opening, as a hole, slit, crack, gap, etc.
shutter- A mechanical device for opening and closing the apertureof a camera lens to expose film or the like.
exposure- The act of presenting a photosensitive surface to rays of light.
depth of field- the range of distances along the axis of an optical instrument, usually a camera lens.
F-stop- The setting of an adjustable lens aperture, as indicated by anf number.
Focal length- the distance from a focal point to a lens to the correponding principal plane.
visible spectrum-the portion of the electromagnetic spectrum that is visible to the human eye.
camera sensor- is a device that converts an optincal image to an electric signal.
Ambient light- The natural light in a scene.
brackets- to over and then under expose from the indicated camera settings.
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