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An optical 'zoom' or 'variable focal length' lens is one that has a range of focal lengths at which it can operate. "Digital zoom" is a technology which simulates optical zoom by cropping the image.

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What is the meaning of W and T on a camera's zoom buttons?

On every conventional digital camera (excluding the models with detachable lenses), there are buttons to zoom in and out with W side and T side. When you press W, the lens zooms out. …
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What is the meaning of W and T on a camera's zoom buttons?

These letters refers to zooming depth as follows: W = Wide angle T = Telephoto Read more about wide-angle and telephoto in the tags.
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