GB/T 12822-1991

GB/T 7553-1987 35mm Camera test chart target GB/T 7700-1987 Bobbins for 16mm motion picture projectors--Dimentions GB/T 9048-1988 Image area produced by 65mm and 70mm motion-picture camera aperture and maximum projectable image area on 70mm motion-picture prints--Positions and dimensions GB/T 9863-1988 Method for determining the speed of colour reversal camera films GB/T 9862-1988 Method for determining the speed and average gradient of black-and-white aerial camera films GB/T 11500-1989 Geometric conditions for measuring transmission density GB/T 12823-1991 Terms，symbols，coordinate system and functional notations for photographic density measurements GB/T 12938-1991 Determination of thiosulphate and other related residual chemicals in processed photographic materials--Iodine-amylose，methylene blue and silver sulphide densito-metric methods