Astro Fov Calculator New! Guide

Overall, it does exactly what it promises – quick FOV calculations – without bloat. Recommended for beginners and experienced amateurs alike.

FOVdegrees=2×arctan(Sensor Dimension (mm)2×Focal Length (mm))×(180π)cap F cap O cap V sub d e g r e e s end-sub equals 2 cross arc tangent open paren the fraction with numerator Sensor Dimension (mm) and denominator 2 cross Focal Length (mm) end-fraction close paren cross open paren the fraction with numerator 180 and denominator pi end-fraction close paren astro fov calculator

The formula you use depends on whether you are observing visually with an eyepiece or capturing images with a camera sensor. Overall, it does exactly what it promises –