Binocular Calculators Useful calculators and formulae.

Convert Field of View in metres to angular FOV in degrees.   Formula:     arctangent   (   Field of View @ 1000m   /   1000   )  

Convert angular FOV in degrees to FOV in metres.   Formula:     tan   (   Field of View   °   )   X   1000  

Convert angular FOV in degrees to apparent FOV in degrees. 65°+ is considered wide angle.   Formula:   Angular FOV   X   Magnification  

Convert angular FOV in degrees to apparent FOV in degrees. 60°+ is considered wide angle.   Formula:   2   X   arctangent   (   Magnification   X   tan   (   Angular FOV / 2   )   )