Polaroid (polarizer) Polaroid (polarizer) Polaroid is a type of synthetic plastic sheet which is used as a polarizer or polarizing filter. A trademark of the Polaroid Corporation, the term has since entered common use. The original material, patented in 1929 and further developed in 1932 by Edwin H. Land, consists of many microscopic crystals of iodoquinine sulphate (herapathite) embedded in a transparent nitrocellulose polymer film. The needle-like crystals are aligned during manufacture of the film by stretching or by applying electric or magnetic fields. With the crystals aligned, the sheet is dichroic: it tends to absorb light which is polarized parallel to
Camera stabilizer operator Garrett Brown invented the Steadicam, a body-mounted stabilization apparatus for motion picture cameras, which uses springs as shock absorbers. In 1991, Martin Philip Stevens (born in England in 1963) invented a hand-held camera stabilizer for motion-picture and video cameras, called the "Glidecam". Some camera stabilization machines use gyroscopes to sense disruptive motion. The Artemis Trinity system from Arri combines a mechanical and electronic stabilization. Although a tripod can hold a camera stably, stationary platforms are not regarded as camera stabilizers. A camera shoulder brace stabilizes by shifting the weight of the camera to the operator's shoulder. This allows for