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Loading contentHow much sky each camera pixel covers, from the pixel size and focal length. Matching the image scale to the seeing (roughly 1–2″ per pixel) is the key to sharp astrophotography.
Formula: s = 206.265 × pixel(µm) / focal(mm)
With the default inputs, image scale evaluates to 0.77556 ″/px — 3.76 µm at 1000 mm → 0.78″/px. The validator recomputes this against the known value on every build, so the formula is checked, not asserted.
Facts on this topic will be cited from these primary and reference sources.
Mission data, planetary science, space telescopes, and public-domain imagery.
Most NASA-produced imagery is in the public domain; individual items are checked for usage terms before publication.