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Real Field of View

Real field of view is the angle of the visible field which can be seen by the user without moving the binoculars. It is measured from the central point of the objective lens. The larger the value is, the wider the view field available.

For example, binoculars with a wider field of view are advantageous for locating fast-moving wild birds within the view field. This also applies for finding small nebulas or a cluster of stars in astronomical observations. An important value which is needed for the calculation of the real field of view is the apparent field of view, which is the angle of the magnified field when you look through binoculars. The larger the apparent field of view is, the wider the field of view you can see even at high magnifications.

$\frac{a}{\frac{s}{e}}$

The values needed to solve this formula are : s= Focal length scope, e = Focal length eyepiece, a = apparent field of view

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