Which camera control primarily adjusts the amount of light entering the sensor?

• A. Aperture
• B. Shutter Speed
• C. ISO
• D. White Balance

Answer: (A)

Aperture is the camera control that primarily adjusts the amount of light entering the sensor. The aperture is the opening in the lens; a larger aperture (lower f-number) lets in more light and brightens the image, while a smaller aperture (higher f-number) reduces light and darkens the image. Other controls influence exposure in different ways: shutter speed changes how long the sensor is exposed to light, affecting brightness with duration; ISO adjusts the sensor’s sensitivity to light, making the image brighter or darker for the same scene; white balance changes color temperature and does not alter the amount of light. So, when you’re focusing on how much light reaches the sensor, aperture is the key factor.