18Concepts in PhotographyShutter speedShutter speed refers to the amount of time it takes to open and close theshutter, and it is an important factor in the brightness of a photo, as itcontrols the amount of light which passes through the aperture before itreaches the image sensor.Usually, the shutter speed is manually adjustable. The measurement of theshutter speed is known as the “Exposure Value” (EV), which is marked inintervals of 1 s, 1/2 s, 1/4 s, 1/8 s, 1/15 s, 1/1000 s, 1/2000 s, and so on.Exposure+1 EV-1 EV1s 1/2 s 1/4 s 1/8 s 1/15 s 1/30 sShutter SpeedTherefore, the faster the shutter speed, the less light will be let in. Likewise,the slower the shutter speed, the more light will be let in.As the photos below illustrate, a slow shutter speed allows more timeto let light in, so the photo becomes brighter. On the other hand, a fastshutter speed allows less time to let light in and the photo becomesdarker and more easily freezes subjects in motion.0.8 s 0.004 s
