Astro FOV Calculator

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Catalog Object

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Telescope focal length (mm)Aperture (mm)

Barlow / reducer factor

Multiplies the telescope focal length. Leave at 1 if a reducer or flattener is already part of the focal length you typed.

Eyepiece focal length (mm)Eyepiece apparent field (degrees)

Results

Equipment Key

Data credits

Objects: OpenNGC by Mattia Verga (CC-BY-SA-4.0). Dark nebulae: E. E. Barnard, 1927 (public domain). Images: Digitized Sky Survey - STScI/NASA, Colored & Healpixed by CDS; cut out with hips2fits, a service provided by CDS. Planet and Moon positions: Astronomy Engine by Don Cross (MIT). Camera list: openMVG CameraSensorSizeDatabase (MIT). Camera specifications: Atik, Player One, QHY, Starlight Xpress, SVBONY, ToupTek and ZWO tables.