Calculation formula of safety shutter

Safety shutter speed = 1/ (lens focal length × effective focal length coefficient).

The formula of safe shutter speed is: safe shutter speed = 1/ (lens focal length × effective focal length coefficient). The formula of safe shutter speed can help the photographer to determine what value the shutter speed of the camera needs to be set when shooting moving objects, so as to ensure that the photos will not be distorted because of motion blur.

The focal length of the lens refers to the focal length of the lens, and the effective focal length coefficient is a constant, depending on the sensor size and brand of the camera. Through the calculation formula of safe shutter speed, the photographer can quickly calculate the safe shutter speed according to the focal length of the lens and the effective focal length coefficient of the camera, thus ensuring that the photos taken are clear and unambiguous.