The ability to change ISO on digital cameras provides the professional (and amateur, if he knows enough about technology) photographer opportunity to create quality images virtually anywhere and anytime.
In a nutshell, ISO technology replaced the old ASA on cameras requiring film. With our older models, we had to change film with different ASA if we wanted a different speed of film. Now, our digital cameras allow us to change ISO on a settings menu with a turn of the dial. No change of film is required, and images are saved on the memory card regardless of ISO setting.
Digital cameras use image sensors instead of film, and ISO (International Standards Organization) simply denotes how sensitive the image sensor is to the amount of light present. If the ISO is set at a high level, for example, the image sensors are more sensitive and pictures can be taken in relatively little light. On the other hand, lower ISO settings are used when more light is available.
Most digital cameras today have an ISO Auto mode, which simply put, means the camera will select a higher or lower ISO, depending on available light. For the amateurs needs for ease of use and quality...
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