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The image stabilization is very important when choosing a camera with a high optical zoom factor (>4). Without this feature, most pictures taken while zooming in, or at longer exposure times, and holding the camera in your hand will be blurred. Note that almost all digital camcorders have image stabilization.
Lens aperture or the f-number is the ratio of the focal length of the lens to the diameter of the light rays passing through the aperture in the iris diaphragm. Smaller numbers represent bigger openings and allow more light to pass through. F-number settings are adjustable; lenses are marked with their maximum aperture (lowest f-number).
Almost all consumer-level digital cameras suffer from a rather long (about 1 second) delay before the picture is taken after the shutter button is pressed. This is a big problem when taking shots of fast-moving subjects, for example in sports. On many cameras this delay can be reduced by half-pressing the button before the shot to focus the camera on the subject.
