Quality and ISO

The task of an image sensor is to register nuances in exposures - in as much detail as possible. It is also necessary to be able to hold a camera in our hands when we take photographs, which means the camera's sensitivity is also important. Sensitivity is measured in ISO values, which state how fast the image sensor reacts to light. The faster, the better - which can give problems with digital noise.

ISO values tell you how fast your camera reacts to light. With a high ISO you can take photographs with a slower shutter speed, which is often an advantage - in bad light, for example, or for exposures with flash or telephotos (i.e. with 6X-zoom).

All cameras have several ISO values to choose between but avoid using the highest, which give digital noise in the image, as seen in Figur 45.

A piece of good advice is, choose ISO 200 or lower for daily use. The quality of ISO 400 and 800 ought to be checked, before you use them in earnest. The image might become gritty and unsharp.

Read here about how you can set your camera's ISO and which values are the best.

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