Camera light metering

light measurementMost cameras are equipped with a microprocessor, enabling automatic setting of the most important operating parameters of the device – e.g.. shutter speed, the size of the aperture. We can also choose one of the "thematic programs"- that is, a set of parameters selected for the type of photography (e.g.. portrait, sport, night photos).

The brecketing option allows you to take a quick series of photos in a very short time (e.g.. four in a second). It is useful, when we have to snap something very quickly and we don't have time to set all the parameters. Then we can choose the best of the few photos taken in this way.


So that the camera can automatically set the shutter speed, must be equipped with a light meter. The most commonly used is the TTL light meter, measuring the intensity of the light entering through the lens. It can work in several modes:

• matrix – measures the light that fills the entire frame and gives an average result. In everyday photography (landscapes, portraits) gives excellent results. However, in high contrast scenes (e.g.. white object on a black background) – the measurement may be wrong;

• centrally weighted – measures light across the frame, however, most precisely – in its middle. Because we usually frame the main subject of the photo in the center of the frame – when taking most of the typical photos, this type of measurement gives the best results;

• spot – it focuses only on a small part of the frame. It's good to choose this mode, when we photograph details;

• multi-point – calculates the correct exposure for a great many – the most important according to the manufacturer – image points. The distribution of points is different for each producer and is based on analyzes of several thousand photos made by him. It gives an excellent effect, but it is only used in expensive cameras.