Silverlog Stars

Silverlog Stars calculates the maximum exposure time for sharp, pinpoint stars — helping you avoid unwanted star trails in astrophotography. HOW IT WORKS Choose your focal length, aperture and camera sensor size. The calculator shows your maximum shutter speed using an established rule (500 Rule, 400 Rule or NPF Rule) so stars remain points of light rather than streaks. FEATURES • 500 Rule and the more conservative 400 Rule • NPF Rule calculation (more accurate for modern sensors) • Seven digital sensor sizes, from 1-inch to medium format • Typical pixel pitch built in for each sensor size, used for NPF results • Star trail mode — see how long your trails will be for a given exposure time • Tonight's moon phase, plus Milky Way visibility for the current month (Northern Hemisphere) • Works offline — no internet connection needed • Clean, focused interface • Dark mode support USEFUL FOR • Milky Way photography • Nightscape and starscape shooting • Choosing the right focal length for astrophotography • Understanding the relationship between focal length and star movement • Planning intentional star trail exposures Part of the Silverlog photography toolkit. No account required. No data collected.