Astrophotography calculators
Browser-local planning tools for camera geometry, spacing and declared mount payload.
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Five focused checks with reproducible examples and explicit limits. These tools do not certify a complete equipment combination.
- Back-focus spacing calculator
Calculate whether your imaging train is too short, matched numerically, or too long for the specified sensor distance.
- Telescope field-of-view calculator
Estimate rectangular camera field width and height from sensor dimensions and effective focal length.
- Pixel-scale calculator
Convert camera pixel pitch and telescope effective focal length to angular image scale in arcseconds per pixel.
- Seeing and pixel-sampling calculator
Express an entered seeing FWHM in pixels using your camera pitch and effective focal length, without an automatic good/bad verdict.
- Mount payload comparison calculator
Compare a declared carried mass with the manufacturer rating for the exact mount configuration and identify an excess explicitly.
Filter sizing is paused. Whole-system compatibility needs verified interfaces, optical specifications and configuration-specific evidence.
Open a tool for its method, units and worked examples. Enable JavaScript to change inputs and calculate your own setup; the explanations remain readable without it.