![]() ![]() ![]() For example, at a focal length of 125 mm on a 35 mm camera, vibration or camera shake could affect sharpness if the shutter speed is slower than 1⁄ 125 second. In photography, image stabilization can facilitate shutter speeds 2 to 5.5 stops slower (exposures 4 to 22 + 1⁄ 2 times longer), and even slower effective speeds have been reported.Ī rule of thumb to determine the slowest shutter speed possible for hand-holding without noticeable blur due to camera shake is to take the reciprocal of the 35 mm equivalent focal length of the lens, also known as the "1/mm rule".
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