The measure of time the shutter is open is known as the

• A. F-Stop
• B. Shutter Speed
• C. Exposure
• D. Focus

Answer: (B)

Shutter speed is the measure of time the shutter stays open during a shot. It describes how long the sensor is exposed to light. This setting is usually shown as fractions of a second (like 1/125) or in full seconds for longer exposures. It directly affects brightness and motion: a fast shutter speed lets in little light and can freeze fast action, while a slow shutter speed lets in more light and can create motion blur. This is distinct from aperture (f-stop), which controls the size of the lens opening and thus light amount, and from exposure, which is the overall brightness resulting from combining shutter speed, aperture, and ISO. Focus concerns sharpness, not exposure timing.