Magnification vs Field of View...

[homestarmy]

When something is magnified 2x, is it safe to say that the angle of view is halfed? For good round numbers, let's say halfed from 90 degrees to 45 degrees. If that is the case, then what would be a 5x magnification or a 10x magnification starting from a good round number like 90 or 100?

Thanks guys!!

 

[JDMnAR1]

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 observed 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, 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.

From: link