Integrates seamlessly with digitized sky surveys (DSS). Stellarium (Oculars Plugin) Pros: Desktop and mobile planetarium software.
The optical length of your telescope or lens (measured in millimeters).
What and camera model do you currently use? Which deep-sky targets are you hoping to photograph next?
Automatically calculates coordinates for multi-panel panoramas based on your equipment FOV and desired panel overlap percentage.
Follow these steps to accurately calculate and preview your imaging field: astro fov calculator 2021
On the last page, folded and yellow, her grandfather had written only one sentence beneath a doodle of a crescent moon: “Measure what you can, but remember — some things are wider than any field of view.” She folded the page shut, looked up, and smiled into the wide, unmeasurable dark.
Check the horizontal and vertical framing against your favorite targets.
Example (Using 2021 common gear):
The Astro FOV Calculator (2021) was not just a formula in a box – it was a bridge between telescope specifications and the real night sky. Whether you were planning a lunar mosaic or checking if M101 would fit your camera’s sensor, this tool saved time, reduced guesswork, and made every session more productive. Even as newer apps with AR overlays appear, the clean, no‑nonsense 2021 calculator remains a reliable favourite in the astronomy community. Integrates seamlessly with digitized sky surveys (DSS)
Select your camera model or manually enter the sensor width, height, and pixel size.
FOV (in degrees) = (Sensor Dimension in mm ÷ Telescope Focal Length in mm) x 57.3
The standard mathematical formula for calculating the FOV (in degrees) for a digital sensor is:
This is the most common method for casual observers: What and camera model do you currently use
It features both a "Visual Mode" (to simulate what you see through an eyepiece) and an "Imaging Mode" (for camera sensors). 2. Telescopius (Formerly DSO Browser)
Ideal for most deep-sky imaging setups under average atmospheric conditions. The 2021 Evolution: Shift to Interactive Framing
FOV (degrees)=(Sensor Dimension (mm)×57.3Telescope Focal Length (mm))FOV (degrees) equals open paren the fraction with numerator Sensor Dimension (mm) cross 57.3 and denominator Telescope Focal Length (mm) end-fraction close paren