Silverlog Stars

Silverlog Stars calculates the maximum exposure time for sharp, pinpoint stars — helping you avoid unwanted star trails in astrophotography. HOW IT WORKS Enter your focal length and sensor/film format. The calculator shows your maximum shutter speed using multiple established rules (500 Rule, NPF Rule) so stars remain points of light rather than streaks. FEATURES • 500 Rule calculation • NPF Rule calculation (more accurate for modern sensors) • Multiple sensor and film format support • Adjustable pixel pitch for precise NPF results • Star trail mode — calculate exposure for intentional trails • 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.