PEEPER on Instagram: "Shutter speed is one of the core principles of photography, controlling how long the camera’s shutter stays open to let light hit the sensor. Measured in fractions of a second—like 1/1000, 1/500, or 1/30—it determines not just exposure, but how motion is captured in an image. With a single adjustment, a scene can shift from perfectly frozen to beautifully blurred. A fast shutter speed, such as 1/1000, opens and closes so quickly that even fast-moving subjects appear sharp.