What does field of view mean

With many binoculars you will see numbers such as 86m @ 1000m, or 143m @ 1000m for examples. So what do these numbers mean ?. In the 86m @ 1000m, this means at a distance of 1000m you can see 86m from one edge of view to the other. If you have a pair of binoculars showing (as in the 2nd example) 143m @ 1000m, you will see 143m from one edge of view to the other. In other words a much wider field of view.

 

 

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