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The amount of a distant scene that can be viewed using a camera lens. This varies with the focal length of the lens and film format.
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A distance, or angle, measure given by binocular manufacturers that's similar to angle of view on a lens. It's usually indicated in degrees or as a width in meters at 1000m. A pair of binoculars with, for example, 6 or 105m at 1000m indicates that you will see a 105m span when you're viewing a subject that's 1000m away. A wider field of view is better for looking at wider expanses - birds in flight, horse racing, starry skies, etc.
A lens with a short focal length used to capture a wider angle of view.
Indicates the magnification and angle-of-view of a lens. The human eye sees things roughly the same as a 43mm focal length of a lens for a 35mm camera. Anything shorter is classed as a wide-angle, while longer focal lengths are telephoto. Because of the comparatively small size of the CCD in a compact digital camera it has a standard focal length of between 6mm and 8mm while a medium-format camera is around 80mm.
Cameras with zoom lenses have either a rocker control, two buttons or a lever to adjust through the focal lengths of the lens. You can adjust this while looking through the viewfinder and then let go when the desired angle of view is reached.