About This Project
Photography Tools
Precision calculators for photographers who want to understand the science behind the shot.
What Is This?
Photography Tools is a collection of calculators designed for photographers who want accurate, science-based settings for their shots. Whether you're shooting the Milky Way, planning a sunrise session, or calculating depth of field, these tools give you the precise numbers you need.
All calculations are performed locally in your browser using real astronomical formulas. No external APIs, no internet required after the page loads. Your settings are saved locally so you can pick up right where you left off.
Created By
This toolkit was created by Owlcto, a creative technology studio focused on building useful tools for photographers and creators.
Visit owlcto.comHave feedback or suggestions? We'd love to hear from you.
Technical Details
🔬 Real Astronomy
Sun and moon positions use NOAA/Meeus algorithms with IAU constants. Accurate to within arcminutes for decades into the past or future.
📐 NPF Rule
Exposure calculations use the NPF rule, which accounts for pixel pitch, aperture, and focal length to determine maximum exposure before star trailing.
🌙 Lunar Ephemeris
Moon phase and position use simplified ELP (Éphéméride Lunaire Parisienne) terms. Pure math - no API calls, works offline.
💾 Local Storage
All your settings are saved in your browser's local storage. Nothing is sent to any server - your data stays with you.
📍 GPS Integration
Use your device's GPS for accurate location-based calculations. Location data is only used locally, never transmitted.
📱 Mobile First
Designed to work great on your phone in the field. Results are shown first, inputs are easy to adjust.
Acknowledgments
The astronomical algorithms in this toolkit are based on Jean Meeus's "Astronomical Algorithms" and the NOAA Solar Calculator. The NPF rule for astrophotography exposure was developed by the French astrophotography community.