Calculator cluster
Astrophotography
500 rule, NPF, lunar eclipse and Milky Way starting exposures, and star-trail stacking time.
Astrophotography
500 Rule Calculator
Estimate the longest untracked shutter for stars with the 500, 300 and 200 rules from focal length and crop factor.
Astrophotography
Lunar Eclipse Exposure Calculator
Starting shutter for lunar eclipse phases from ISO and aperture: penumbral, partial, bright total umbra and dark Danjon totality.
Astrophotography
Milky Way Exposure Calculator
Starting Milky Way shutter from the 500 rule, a suggested ISO scaled from f/2.8 and 20 s at 3200, plus night EV at those settings.
Astrophotography
NPF Rule Calculator
Get a pixel-aware untracked star shutter from focal length, aperture, pixel pitch and an accuracy factor — tighter than the 500 rule on high-MP bodies.
Astrophotography
Star Trail Stacking Calculator
Work out stack length, sky-trail arc from Earth’s rotation and a 30 fps video duration from total minutes, interval and declination.
Other clusters
- Optics & depth of fieldDoF, hyperfocal distance, circle of confusion, macro DoF and diffraction limits.
- Exposure & lightEV, ND filters, exposure shift, flash guide numbers and the Sunny 16 rule.
- Sensor & focal lengthCrop factor, equivalent aperture, angle of view, field of view and print size from megapixels.
- Timelapse & videoTimelapse intervals, file size, shutter angle, slow motion and drone mapping overlap.
- Studio, storage & utilitiesCard capacity, handheld shutter speed, inverse-square falloff, aspect crops and pinhole diameter.