What does TTL stand for in the context of photography?

In the context of photography, TTL stands for "Through the Lens metering." This refers to a method used in cameras for measuring the light in the scene through the lens itself, rather than using an external sensor or reflective meter. When TTL metering is utilized, the camera evaluates the light that comes through the lens and can make adjustments to exposure settings accordingly. This allows for more accurate exposure measurements, especially in situations where lighting may vary across the scene or when using different lenses.

TTL metering is particularly beneficial when using flash, as it helps ensure that the right amount of light is emitted for proper exposure, as it meters the light after the lens. This capability enhances overall image quality by making exposure settings more precise based on real-time conditions.