Astro Fov Calculator Top Jun 2026

: Determine if your camera’s sensor size matches your telescope’s focal length without "clipping" the edges of your target.

TFOV (degrees) = AFOV / Magnification

Stellarium is free, open-source planetarium software. While it is primarily used for visual astronomy, it has a powerful "Oculars" plugin. By entering your specific equipment profiles, you can toggle a view that shows exactly what your camera sees. It renders the actual background stars and DSOs, making it the most intuitive visual calculator available. astro fov calculator top