LUMEN - Analog Exposure & Log

LUMEN is a light meter and film log for analog photographers.
Point your phone at a scene, and LUMEN reads the EXIF data from the photo to calculate correct exposure combinations for your film. Choose from the calculated aperture and shutter combinations — or enter them manually. Then log the shot to your film roll with an optional note and thumbnail.

FEATURES

• Light metering via camera or gallery photo
• Exposure calculation for any film ISO (25–3200)
• EV compensation in ½-stop steps
• Manual aperture and shutter entry
• Film roll log with frame counter
• Notes and thumbnails per frame
• Export film log as formatted HTML or plain text
• Save directly to Downloads or share via any app
• Leica-style HTML export with embedded thumbnails

PRIVACY

LUMEN is fully offline. No internet connection, no analytics, no accounts, no tracking. All data stays on your device. Export files only leave your device when you explicitly choose to share them.

Designed for photographers who shoot film and want a clean, distraction-free tool.