ReciproMeter vs Light Meter

ReciproMeter is a light meter for film photographers who need dependable long-exposure calculations. Use your iPhone camera to read exposure metadata, select your film stock and aperture, and get an immediate shutter recommendation. When exposure times run long, ReciproMeter applies reciprocity correction using official manufacturer data whenever available. For films where official datasheets stop short, ReciproMeter keeps the distinction clear: • Official manufacturer reciprocity data • Optional community-sourced long-exposure guidance • Optional experimental estimates, clearly labeled as lower confidence Features: • Live camera metering with full-screen exposure view • Exposure lock for holding a reading while composing • Built-in film library with official reciprocity sources • Community and experimental long-exposure tiers as separate opt-ins • Metering ISO / EI override for push-pull workflows • Bulb timer for corrected long exposures • Dark mode, light mode, or system appearance

Transform your phone into a professional light meter with this all-in-one tools app designed for filmmakers, photographers, growers, and lighting enthusiasts. Accurately measure illuminance in both Lux and Foot-Candle, and instantly capture Correlated Color Temperature (CCT) in Kelvin to ensure the perfect ambient lighting environment every single time. Built with an intelligent, highly advanced calculation engine, the app delivers quick and reliable Lux estimations directly from your device's sensor without the need for expensive external hardware. Want to track light stability and shifts over time? Use the powerful, interactive 2D real-time graphs to seamlessly monitor fluctuations in both brightness and color temperature during your sessions. Whether you are setting up studio lights, balancing indoor grow setups, or auditing office workspace conditions, this sleek and intuitive interface provides the precise visual data you need. Optimize your lighting workflow like a pro today!