Things to know about digital zoom
A digital zoom simulates having an optically longer (more powerful) lens by electronically enlarging the image from the CCDs. What you gain in enlargement you lose in resolution.
A tight digital zoom of a wall cloud for example will produce less detail than a similarly-framed close-up with no digital zoom. You may think you will end up with an extremely nice close-up but what you are more likely to end up with is a bunch of large, non-descript, pixels. The tiny viewfinders on most camcorders make scenes shot with digital zoom look a lot better than they it will look on your big TV at home.
Optical zooms, close-ups which use the magnifying power of the lens itself, are preferable but keep in mind that the longer the lens the less light reaches the imager and the darker your video may appear. And remember, with either type of zoom the more you zoom in the more camera shake, even minor shake, will look like an earthquake.
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