Lumina Meter

Lumina is a precision light meter designed for film photographers. Turn your iPhone into a professional-grade metering tool with real-time exposure analysis powered by Metal GPU rendering. METERING MODES - Spot: Precise single-point metering for critical exposure control - Center-Weighted: Classic center-biased metering for balanced readings - Matrix: Advanced 3D matrix metering with scene analysis, highlight protection, and film latitude awareness - Distance: Real-time LiDAR depth measurement for zone focusing and hyperfocal calculations (Pro iPhones) LIDAR DISTANCE On Pro iPhones with LiDAR, Lumina measures real-time distance to your subject — right in the viewfinder. Invaluable for manual focus lenses, zone focusing, and nailing critical focus in the field. ZONE SYSTEM Real-time Ansel Adams Zone System display (Zone 0–X) lets you visualize exactly where your scene falls — from deep shadows to pure highlights. EXPOSURE TOOLS - Live histogram with luminance distribution - False color overlay for instant exposure mapping - Zebra stripes for highlight and shadow warnings - Aperture priority, shutter priority, and manual modes - ±3 EV compensation with third-stop precision FILM STOCK PROFILES Built-in presets for popular film stocks including Portra, Ektar, Tri-X, HP5+, Velvia, and more. Lumina adjusts metering behavior based on each film's dynamic range — slide films get aggressive highlight protection while negative films maximize shadow detail. BUILT FOR FILM - EV100 readout with 1/3 and 1/2 stop increments - Full ISO, aperture, and shutter speed controls - Calibration offset for matching your handheld meter - Clean, dark interface designed for use in the field PRIVACY FIRST All camera and LiDAR data is processed entirely on-device. No analytics, no tracking, no accounts. Your data never leaves your iPhone.