Changing the 'film speed'
In an 'old type' of camera, you could change the film according to the weather or type of picture that you wanted to take. Thus, some films were described as slow, others fast etc.
With a digital camera, you can achieve the same result (in most cases) simply by changing a setting on the menu – the ISO sensitivity. ISO values on a digital camera generally range from about 50 to 400. An ISO setting of 50 is often selected when the light is good and an image rich in detail is required. A higher setting is used when you are trying to take an action shot (with a high shutter speed) or when the light is not so good.
Some digital cameras offer ISO settings from 50 to 1600. So, if you are keen on photographing amateur dramatics without using flash, then you might want to look for a camera that offers a high ISO setting.
