The hole in the camera that allows light to enter is called what?

• A. Aperture
• B. Shutter
• C. Lens
• D. ISO

Answer: (A)

Light entering a camera is controlled by an adjustable opening in the lens called the aperture. This hole determines how much light reaches the sensor during an exposure. A larger opening lets in more light and uses a smaller f-number, which also creates a shallower depth of field. A smaller opening lets in less light and increases depth of field, keeping more of the scene in focus. The aperture works together with the shutter, which sets how long the sensor is exposed, and with ISO, which sets the sensor’s sensitivity to light. The other terms don’t describe the opening: the shutter is the mechanism that opens and closes to expose the sensor; the lens is the focusing element; ISO is the sensor sensitivity setting.