Flash memory- a type of reprogrammable memory that retains information even with the power turned off.
Scale-focus- graduated scale to indicate appropriate lens-to-image plane positions for given lens-to-object plane distance.
Lens cap- cap used to keep lens free of dust when not in use.
Digital cameras- a camera that encodes an image digitally and stores it for later reproduction.
Aperture- an opening, usually circular, that limits the quantity of light that can enter an optical instrument.
Shutter- a mechanical device for opening and closing the aperture of a camera lens to expose film or the like.
Exposure- is the amount of light allowed to fall on each unit of a photographic.
Depth of field- the closer the subject to the camera, the more shallow the depth of field.
F-stop- is a value that indicates the size of the lens aperture used during the taking of a photograph.
Focal length- the focal length determines how much magnification it provides.
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