What best describes TTL flash compared to manual flash power control?

• A. TTL flash automatically meters through the camera to set exposure; manual flash requires you to set power manually
• B. TTL flash requires you to carry an external light meter
• C. TTL flash cannot be used with ISO adjustments
• D. TTL flash is only used in studio settings

Answer: (A)

TTL flash uses the camera’s metering to determine the correct flash output automatically. It sends a pre-flash, the camera measures the reflected light, and the system adjusts the flash power so the exposure matches what the camera expects. You can still influence the result with flash exposure compensation, but you don’t manually pick a fixed power level. Manual flash, by contrast, requires you to set the power output yourself (like full, 1/2, 1/4, etc.), relying on your own measurements or test shots to achieve the desired exposure. TTL isn’t limited to studio work and is commonly used on location with both on-camera and off-camera flashes; it also works with ISO changes without requiring an external meter.