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In a mechanical lens system the zoom changes the focal length making the image bigger. Functionally, only a certain area of the image remains visible to the observer/film.

Angle of view is the amount of area visible at one time.

Focus is an adjustment between the magnification lenses to keep the image sharp and not blurry.

In a digital system the processor scales the pixels captured by the ccd to create the illusion of zoom. A high digital zoom make pictures look block-y.

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