Through-the-lens

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Through-the-lens (TTL) metering is a photographic technique in which measurements (usually of light levels) are made through the lens of a camera. The term most often refers to controlling the amount of light emitted from the flash by measuring the light falling back into the flash sensor – through the camera's lens.

In TTL, flash metering occurs after the shutter has been opened – the sensors record the amount of flash-created light returning to the camera through the lens and automatically shut off ("quench") the flash when an appropriate amount of light has been produced.

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