prime lens is either a photographic lens whose focal length is fixed, as opposed to a zoom lens, or it is the primary lens in a combination lens system.
wide-angle lens refers to a lens whose focal length is substantially smaller than the focal length of a normal lens for a given film plane
Calypso 35mm film camera was conceived by the marine explorer Jacques-Yves Cousteau (1910—1997), designed by Jean de Woutersand manufactured by Atoms in France.
Through-the-lens (TTL) metering is a photographic term describing a feature of cameras capable of measuring light levels in a scene through their taking lenses, as opposed to a separate metering window
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