In which mode does the on-camera flash typically fire when lighting is insufficient?

• A. Manual
• B. Shutter Priority
• C. Aperture Priority
• D. Full Auto

Answer: (D)

When light is low, you want the camera to add light on its own. In Full Auto, the camera meters the scene and automatically decides to fire the on-camera flash if the ambient light isn’t enough, using TTL flash to help balance exposure. This automatic decision is what makes Full Auto the mode where the flash typically fires without you adjusting anything. In manual, you choose whether the flash goes off; in shutter or aperture priority, you control exposure parameters, and the camera won’t automatically fire the flash unless Auto Flash is enabled, so those modes aren’t the standard for automatic fill in low light.