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<\/figure><\/div>\n\n\n\nPhotometry<\/p>\n
At first, inside the camera, there is a measurement system called a photometer. This system known as TTL (through the lens) is responsible for reading the light input through the objective and, therefore, responsible for calculating the crossing of information between the aperture of the diaphragm versus the shutter exposure time, in addition to the sensitivity ISO, as seen in the exposure triangle.<\/p>\n
However, if you haven't read it, go back to the previous articles on the exposure triangle.<\/p>\n
Photometers can be built-in or external. The photometers built into the cameras calculate the light that is reflected by the object to be photographed, taking into account the light that will be lost as it passes through the objective. External photometers, on the other hand, work with light incident on the scene, based on the sensor's sensitivity settings established by the photographer. The main difference from the built-in photometer is that you don't have to worry about the color of the scene or the objects independently.<\/p>\n
In digital camera viewfinders, it appears as a scale that varies for negative (left) and positive (right) numbers, with in the center marking what is considered a balance during shooting.<\/p>\n\n\n\n
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