Usually ranges from 250mm (wide-field refractors) to over 2000mm (Schmidt-Cassegrains).
Rotate the framing box to find an angle that captures balancing features, like framing the Flame Nebula alongside the Horsehead Nebula.
Focal Length of Telescope/Binoculars (mm): Focal Length of Eyepiece (mm): Eyepiece Diameter (mm) (optional):
: The physical size of an individual pixel on the sensor, measured in microns ( astro fov calculator 2021
By 2021, Astrobin had integrated its massive image database into the FOV calculator. If you searched for "Rosette Nebula" with a RedCat 51 and ASI 183MM, the 2021 tool showed you not just a rectangle, but actual stacked images from other users with that exact rig.
(specifically the sections regarding CCD and CMOS imaging geometry). However, for a more modern technical overview of FOV calculations in the context of robotic telescopes and surveys, the following paper provides the necessary mathematical framework: Recommended Paper
If you want to map out a specific target right now, let me know you are using, or provide your focal length and sensor dimensions . I can help you compute the exact field of view, pixel scale, and target recommendations for your setup. Share public link Usually ranges from 250mm (wide-field refractors) to over
By utilizing these tools and calculations, you eliminate guesswork, optimize your limited time under dark skies, and ensure your equipment is perfectly matched to your chosen astronomical targets. If you want to map out a specific project, let me know: Your or focal length Your camera model or sensor dimensions The celestial object you want to image
The focal length magnifies the sky beyond what atmospheric seeing can support, resulting in blurry images without extra detail.
(Calculate once for sensor width and once for sensor height to get the full framing dimension). If you searched for "Rosette Nebula" with a
Enter the catalog number of your target (e.g., M31, NGC 7000, IC 434).
: A simpler, highly visual tool ideal for beginners to see how the Moon or planets look through different apertures. BBC Sky at Night FOV Calculator
For imaging, the calculation is:
He spent the next hour playing with the "Arc" feature. The "Astro FOV Calculator 2021" wasn't just a math tool; it was a pre-visualization engine. He dragged a digital overlay of the Milky Way onto a Google Maps satellite view of the desert formation he planned to visit. He saw that at 14mm, the rocks would be too far away. He needed to be closer, or he needed to shoot a panorama.
: Look up your camera’s sensor width and height (e.g., a Full Frame sensor is