Field of View

 

The size of the area that can be seen while looking through a pair of binoculars is referred to as the field of view. The angular field of view is indicated on the outside of the binocular, in degrees. The linear field of view refers to the area that can be viewed at 1,000 yards, and is expressed in feet. A larger field of view translates to a larger area seen through the binocular.

Field of view is related to magnification, with greater magnification creating a smaller field of view, in general. A large field of view is especially desirable in situations where the object viewed is likely to move, a large terrain area is viewed, or when the user is moving.

You can use angular field to calculate the linear field by multiplying the angular field by 52.5. For example, if the angular field of a particular binocular is 8° then the linear field will be 420 feet, i.e. the product of 8 x 52.5. Or, you can divide the linear field by 52.5, e.g. the binocular has a field of view of 390 feet at 1,000 yards, so 390 divided by 52.5 is 7.43° .