TTL stands for Through the Lens.
TTL refers to a metering system that determines the proper exposure based on measuring the light that strikes the imaging sensor (or film plane) after passing through the camera’s lens. TTL readings are usually more accurate than handheld meter readings since all exposure factors, including filtration and any optical peculiarities, are taken into account when determining the final exposure. Many dedicated camera flashes also utilize TTL metering to determine the proper flash exposure.
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