The Selection of Optimum Exposure in Aerial Photography

Resolution is the main standard in evaluating image quality. The determination of the relationship between statical resolution of aerial film and exposure by improved Chinese-built 9 w microdensitometer was introduced in this paper. The expiate corresponding to maximum resolution is the criterion for determinating aerial film speed, therefrom the maximum density (D_max), minimum density (D_min), image contrast(ΔD) and average density (D_R) could be determined on the basis of optimum resolution. Four kintis of aerial film including Chinese-built 1022T, 1022P and Kodak 2402, 2412 were investigated. The results shown in this pager could be consindered as foundation in modifing specification in aerial photography.