Astro Fov Calculator Top New! -
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For cameras, the FOV depends on sensor size and focal length:
Stellarium is a powerful planetarium software that includes a "Sensor/Eyepiece" plugin.
FOV (degrees) = 2 × arctan (eyepiece diameter / (2 × telescope focal length)) astro fov calculator top
It pulls framing data from offline or online sky caches. You enter your coordinates, and it gives you a precise FOV box.
Several free and premium tools cater to different workflow preferences, offering web interfaces, desktop software, or mobile applications. 1. Astronomy Tools FOV Calculator (Web-Based)
When using these tools, you will encounter several technical metrics. Understanding them will elevate your imaging quality: What It Means Why It Matters The dimensions of the sky captured (e.g., Tells you if a target fits in a single frame. Resolution (Pixel Scale) This public link is valid for 7 days
With so many options, here are key considerations to help you choose the best tool for your needs:
| Tool Name | Platform | Key Features | Target User | | :--- | :--- | :--- | :--- | | | Web | Three dedicated modes for visual, imaging, and binoculars; extensive equipment and target databases; visual simulation of object framing | All skill levels | | BINTEL FOV Calculator | Web | Newly launched, beta, photographic and visual scenarios; uses DSS2 Colour, PanSTARRS catalogues; supports custom equipment | Intermediate to advanced | | Stellarium Mobile / Stellarium Labs | Mobile & Web | Popular planetarium app with an integrated FOV Simulator; simulates views through eyepieces and cameras; connects to telescope control | All skill levels | | FOViewer Deluxe | Android | Simulates the view through your telescope with chosen eyepieces; supports custom telescopes, eyepieces, Barlows, and cameras; includes GPS and compass | Amateurs and intermediates | | Telescope Eyepiece Calculator | iOS (iPhone, iPad, Apple Watch) | 100% offline tool; supports custom eyepiece types, Barlow/reducer multipliers; night mode and haptic feedback | All skill levels | | Telescope Calculator Pro | Android | Calculates a wide range of parameters including FOV, magnification, exit pupil, angular resolution; provides visualizations | All skill levels | | KStars | Desktop (Windows, macOS, Linux) | Open-source planetarium with an FOV editor to calculate and display FOV for equipment; integrates with INDI for telescope control | Advanced |
Quick visual framing checks and matching cameras to telescopes. Can’t copy the link right now
The desktop version of Stellarium is the original and still one of the most powerful planetarium programs available. Its built-in allows you to simulate the view through any eyepiece or camera, showing exactly how a target will be framed. It's highly customizable and supports a vast array of equipment, making it an essential tool for planning complex astrophotography sessions.
Here are the best online and app-based calculators to use for your astronomy planning. 1. Astronomy Tools FOV Calculator
A quick way to estimate the True Field of View is the ratio of the eyepiece's AFoV to the magnification: