TTLljusmätning

TTLljusmätning refers to Through-The-Lens light metering. This is a photographic technique where the camera's internal light meter measures the light passing through the lens and diaphragm before it reaches the film or digital sensor. This measurement is then used by the camera to determine the correct exposure settings, such as aperture and shutter speed.

The TTL system is considered more accurate than external light meters because it accounts for the light loss that occurs as light passes through various lens elements and the camera's aperture. Different camera systems employ various TTL metering modes, such as evaluative (or matrix) metering, which divides the scene into multiple zones and analyzes each zone's brightness, center-weighted metering, which prioritizes the center of the frame, and spot metering, which measures a very small area of the scene.

Modern digital cameras predominantly use TTL light metering. Early camera models utilized external light meters, which measured the light falling directly on the subject. The adoption of TTL metering significantly improved the convenience and accuracy of exposure control for photographers. Understanding TTLljusmätning is fundamental for photographers seeking to achieve well-exposed images consistently.