In this paper veiling glare is defined and its general aspects in aerial photography are discussed. Experimental results showing the effect of glare on the resolving power of a standard aerial film are presented in the form of graphs. A method of measurement is described and typical amounts encountered in widely used aerial cameras are given. From the results it is shown that veiling glare commonly causes a loss of photographic speed of as much as 100% where resolving power is the primary consideration. Recommendations are made for minimizing flare in cameras.