Astro Fov Calculator 2021 ((exclusive)) · High Speed
An astronomy FOV calculator is a specialized tool that simulates how a celestial object (like a galaxy, nebula, or planet) will appear through a specific combination of equipment. It essentially "previews" your shot or view before you set up your gear. Key Features and 2021 Standards
In 2021, the community largely converged on three main tools. If you are looking for the "2021 experience," these are the ones to use.
Tools started syncing directly with capture software like NINA (Nighttime Imaging 'N' Astronomy) and Sequence Generator Pro. Instead of manually copying coordinates, users could frame a target in the calculator and export the exact framing, camera rotation angle, and center coordinates directly into their telescope's sequencing software. Rise of Mobile and Web-Based Apps
also help determine your pixel scale to avoid under-sampling or over-sampling your image. Gear Selection
Focal Length of Telescope/Binoculars (mm): Focal Length of Eyepiece (mm): Eyepiece Diameter (mm) (optional): astro fov calculator 2021
To calculate the horizontal or vertical field of view in degrees, calculators use this trigonometric formula:
Let’s test this with a classic large Dobsonian telescope and a standard DSLR.
The physical dimensions of your camera sensor (width and height in millimetres) dictate the boundaries of the image frame. Common sensor formats include: Approx. 36mm x 24mm APS-C: Approx. 22mm x 15mm Four Thirds (4/3"): Approx. 18mm x 13.5mm
: A user-friendly tool provided courtesy of David Campbell that specializes in helping beginners select equipment combinations for specific Messier and NGC targets. Z-Astro-Calculator An astronomy FOV calculator is a specialized tool
(in advanced versions) Visualise how changing eyepieces or adding a Barlow lens affects the view.
A robust planning tool featuring an interactive sky database. It allows you to rotate the camera sensor dynamically to plan complex framing angles.
The standard unit. The full moon spans about 0.5 degrees. Arcminute ('): One-sixtieth (1/60) of a degree.
Most calculators allow you to rotate the sensor box (0° to 360°). Use this feature to align long nebulae diagonally across your sensor to maximize space. Note the angle so you can physically rotate your camera on the telescope to match. Matching Targets to Your FOV: Examples If you are looking for the "2021 experience,"
The physical width or height of your camera chip.
The field of view (FOV) is the angular diameter of the sky that can be observed with a telescope or binoculars. It is usually expressed in degrees or minutes of arc. The FOV depends on the instrument's aperture, focal length, and eyepiece specifications.
Simulating real-time field of view, including camera rotation angles. Visuals: Dynamic, real-time rendering of the night sky. Step-by-Step: How to Plan a Target Composition
: A newer setup simulator that helps pair cameras with telescopes and accessories like Barlow lenses or reducers.