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WRC 9 FOV CALCULATOR HOW TO

With the segment method, the angle is different, 7.1619°. This means that it doesn't matter which triangle method we use to calculate the angle. With the triangle method, the angle γ in both cases is 7.1666°. We can see that there are some differences between both calculation methods.

From an arc length equation, we can calculate γ angle:.

To calculate the angle, we need an equation for the arc length:.

The law of cosines is used for calculating the angles of a triangle if we know all three sides (as it is in our case).įor calculation, we use the same triangle as we did in the first case, with a peak at the lens and the base at the field of view. If we use the second method, there is no need to divide the triangle. Then we calculate the value of cathetus an (adjacent to angle γ) using the equation below (Pythagorean theorem:Īfter we calculate the length of all three sides of a right triangle then we can use trigonometry to calculate the angle γ. With binoculars, spotting scopes, and other optical devices the field of view is measured at 1000m, so the hypotenuse is also 1000m. With riflescopes, the hypotenuse is set at 100m because the field of view is being measured at 100m. The value of hypotenuse (h) also depends on a field of view value.

WRC 9 FOV CALCULATOR HOW TO

If you are still not certain what is the size of the angle on your binocular, here are some methods how to calculate it.įirst, we calculate the value of cathetus o (opposed to angle γ). Most manufacturers already state how much is the angle of view on their optical devices. This article will help you if FOV is expressed in meters or yards and you want it to be in degrees. I wrote this article because I wanted to show you how to convert linear FOV to angular FOV and the other way around. If the angle is high this means that the field of view is wide – the higher the angle, the wider the field of view. Besides the linear field of view, there is also an angular field of view where the field of view is provided in angular degrees. Measurements in yards, feet, and meters are called the linear field of view. Field of view can be expressed in multiple measurements.

It depends on the build of the eyepiece, thickness of the lenses and it is also affected by magnification. Field of view is the measured area of the scene a person sees when looking through the binoculars.