In photography, speed is very important film setting. Film different occasion often wants to choose different ISO speed. In the situation with favorable light, choose low speed, can get Gao Hua pledges video. Filming spot light is very dark, perhaps use the slowest rate with the biggest aperture, cannot catch effectively video, if some lights get radial news and sports match circumstance, need chooses high speed, want to assure to film above all, catch video itself sometimes videoer than acquiring high quality more important, can taking the picture is the first.

The grain of speed and photograph, solution becomes inverse ratio concern like force and resolution. The film with small speed is become tall like quality, resolution is high, grain is exquisite; The film with high speed, grain increases, and resolution can drop. Although the speed of film also has a lot of kinds, but, compared with the number adjustable for type speed, its adjusting range is little at digital camera. Digital camera is in speed choice, patulous on have very large dominant position.

Digital camera changes speed with changing the way of the enlarge fold of signal. The speed of digital camera is OK from ISO100, 200, 400, 800, 1600, 3200 be chosen choose, some camera can expand speed ISO50 is mixed 6400. It is besides multiple of afore-mentioned whole class, still can have the half archives, setting that is 1/3 archives even, come so, the speed level of digital camera shares very fine, from 50 ～ 6400 between distributing very even, install include the entire section of speed, when taking a picture, can be aimed at all sorts of different situations, choose a the most appropriate speed setting. The speed of film has ISO25, 50, 64, 100, 125, 160, 200, 400, 800, 1600 etc, partition is very thin also, quite practical, but the fractionize compared with the number, still have different. For instance, film speed 400 and 800 between, classification not fine, digital ISO classifications can be 400, 500, 640, 800, much two choices, selection of this bits can rescue a piece of photograph with film difficult possibly, find optimal balance in order to be in content and quality to nod. A film has a speed only, change speed must change film, the number is OK every film one piece changes a kind of speed, was equivalent to carrying the film of near 20 kinds of different speed. Still can install follow one's inclinationsly at the same time colour temperature, reach the level of colour temperature and as delicate as any spots balance, made up for film to have solar, light only two kinds of balances are colour temperature the inadequacy besides, such come saying, camera of a number is equivalent to library of a film -- such saying that had not been.
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