Prime Lens (FFL) - a prime lens is either a photographic lens whose focal length is fixed
Wide- Angle Lens - a lens whose focal length is substantially smaller than the focal length of a normal lens for a given film plane.
Calypso underwater camera - is an affordable, yet sophisticated waterproof inspection camera.
Through-the-lens metering - 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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