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: The flash sends a quick, low-power burst before the main exposure.

: The flash fires at that specific power as the shutter opens. Ttl Models Images

Instead of manually setting flash power, the camera and flash communicate to determine settings. : The flash sends a quick, low-power burst

: The camera's sensor measures the light reflected back from the subject. : The flash sends a quick

: It instantly calculates the power needed to achieve a "neutral" exposure (aiming for 18% gray).