visible spectrum- the range off wavelengths of visible radiation. electromagnetic spectrum- the entire range of radiation extending in frequency. diaphragm- the controlling of the diameter of the aperture. imaged sensor- to store photographs aperture- an enclosed hollow with an opening. shutter- contained within the lens structure. exposer- the size of the aperture and the brightness of the scene controls tube amount of light that enters the camera. depth of field- is the distance between the nearest and farthest objects in a scene that appear acceptably sharp in an image. F-stop- it's a dimensionless number that is a quantitative measure of lens speed, an important concept in photography. focal length- is a measure of how strongly the system converges or diverges light.
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