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Optical vs Digital Zoom
Suggestion: Try not to use the digital
zoom function.
Cheaper camera models come only with digital
zoom, whilst the high-end ones come with
both optical and digital zooms. Optical
zooms work basically like your conventional
zoom lens whereby lens elements in various
groups are moved to change the focal length
of the lens.
Digital zooms are only present in digital
cameras, and basically work by utilizing
only a smaller portion of the CCD element. (The
CCD, or charge-coupled device, records
picture information.) This reduces the angle
of view and hence gives the impression that
you are closing in on a subject far away.
Image quality obviously suffers when a
smaller area of the CCD is used to represent
the same image size. There is a noticeable
increase in "noise" in the final image,
which can be compared to graininess in
conventional film. Hence, image quality is
high for optical zooms and rather poor for
digital zooms.
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