A zoom lens is an element that adjusts the focal length and are normally described the the ratio of the shortest to longest focal length. Focal length is the distance between the center of the lens and the image sensor. Only optical zoom is consistently useful and has higher optical resolution because it measures the focal length. A negative aspect of a zoom is that when on it's highest magnification the shutter response time is much shorter. It can also cause for the sides of the picture to be distorted.
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