Easy "magic" formula for Linear Horizontal FOV

E

Ernest49

Member
Today I want to make a small but very useful gift to American night hunter friends. I give you a small, easy easy (I called it "magic" ..) formula to calculate the Linear Horizontal FOV (LHFOV) of a thermal device at a distance of 1000 yards.

LHFOV = ((Horizontal sensor pixels)x(pixel pitch))/(focal length).

We do the Linear Horizontal FOV calculation of 3 brand new devices.

1) Kirsch's SUPER YOTER

LHFOV = 640x12/50 = 153.6 yards;

2) Skinney's RICO BRAVO 35mm

LHFOV = 384x12/35 = 131.7 yards;

3) Ernest49's THERMION 2 XP50

LHFOV = 640x17/50 = 217.6 yards.

Of course, to have the Linear Horizontal FOV at a distance of 100 yards, just divide these values by 10...

(questo facile calcoletto lo lascio a voi....)
 
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