Astro Fov Calculator 2021 Jun 2026

This was the browser-based workhorse. Its "Imaging Mode" allowed you to select from a dropdown of 100+ telescopes and 50+ cameras. The 2021 update added "Object Lists"—you could load the Messier catalog and cycle through targets to see how each framed up.

FOV (arcminutes)=Sensor Dimension (mm)×3438Focal Length (mm)FOV (arcminutes) equals the fraction with numerator Sensor Dimension (mm) cross 3438 and denominator Focal Length (mm) end-fraction astro fov calculator 2021

That was when he typed the search query that would save his trip: This was the browser-based workhorse