虽然近代胶片的感光度已有显著的提高,在一般情况下摄影者不会感觉胶片的感光度太低。但是在一些特殊的场合,仍会出现胶片感光度不够的情况。例如,科研中的超高速摄影、拍摄暗淡天体的天文摄影,红外摄影以及各种在照明条件不够下的摄影等等。这时就需摄影者自行设法弥补胶片感光 Although the sensitivity of modern film has been significantly improved, under normal circumstances photographers will not feel the film’s sensitivity is too low. However, in some special occasions, there will still be film sensitivity is not enough. Examples include ultra-high-speed photography in scientific research, astronomy photography in dim objects, infrared photography, and photography in under-lighting conditions. At this time need to try to make up for the film camera photosensitive