shutter- a movable cover, slide
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 lens aperture, as indicated by an f number
focal length- the distance from a focal point of a lens or a mirror to the corresponding principal plane
visible spectrum- the range of wavelengths of electromagnetic radiation that is normally visible from 380 to 760 nm.
electromagnetic spectrum-the entire spectrum, considered as a continuum, of all kinds of electric, magnetic, and visible radiation, from gamma rays having a wavelength of 0.001 angstrom to long waves having a wavelength of more than 1 million km.
diaphragm- to reduce the aperture of (a lens, camera, etc.) by means of a diaphragm.
camera sensor- a darkened boxlike device in which images of external objects, received through an aperture, as with a convex lens, are exhibited in their natural colors on a surface arranged to receive them: used for sketching, exhibition purposes
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