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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.