ISO

Chapter  Twelve

*ISO* also called *(ASA/FILM)* speed. *ISO* determines how fast the film or *(CCD)* sensor reacts to light. The slower the speed, the slower the reaction to light so longer shutter are required which, in turn, will affect the aperture you can use.

 The *ISO* speed is fixed for film-based cameras. Those silver squares you see on the film casing tell the camera what the film’s *ISO* speed is.

On (digital cameras), the *ISO* speed determines how fast the sensor responds to light. This setting can be changed to any *ISO* setting the camera provides, so you have much more freedom in the picture you can take. You could take one photo exposure as *ISO* 50 in good daylight conditions, the next one might be at *ISO* 1600 to bring out detail at night and so on. Both film and *(CCD)* sensor suffer from grain. Both fine granularity at low .*ISO* settings and both have noticeable grain at high *ISO* setting. So there is a trade-off between the amount of grain you want in your final image the *ISO* speed that’s called for in any given situation.

Let’s talk about Exposure in next chapter. If you have any question

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