An Astro FOV calculator is a tool—often a simple online web app, a smartphone utility, or a built-in feature of planetarium software—that predicts exactly how much sky you will see through a specific combination of telescope and eyepiece. It bridges the gap between theoretical numbers and practical observing.
Calculates the field of view (FOV) for astrophotography given sensor size and focal length; can also compute required focal length for a desired FOV, and plate scale (arcsec/pixel). astro fov calculator top
Telescopius.com is a modern, fast-loading web tool that excels at framing images. It allows users to simulate targets within their FOVs, making it easier to select the best orientation for a camera sensor, including support for image rotation and mosaic planning. An Astro FOV calculator is a tool—often a
Telescopius is more than just a calculator; it is a full-scale planning suite. Telescopius
No math required — just a stopwatch.
| Tool Name | Best For | Key Features | | :--- | :--- | :--- | | | All-Round Excellence | Extensive equipment database (over 1000 items), visual simulations, multiple catalogs | | Stellarium | Integrated Desktop Experience | Free, open-source, combines a planetarium with an FOV editor | | Astronomy.tools | Quick Online Checks | Simple web interface, visual mode for simulating object view | | KStars / Ekos | Advanced Astrophotography | FOV editor, full observatory control for automated imaging | | NightPortal | Mobile-Friendly Planning | Phone-friendly toolkit with an all-in-one FOV calculator, target finder, and sky guide | | 12Dstring FOV Calculator | Simple Web Use | User-friendly web interface, frequently recommended for framing | | Sampsoid FOV Calculator | Core Calculations | Focuses on FOV computation using sensor size and focal length |