LightMeter Express vs SlowLightMeter

LightMeter Express - Professional Camera Tool Transform your iPhone into a precision light meter for film and digital photography. Get accurate exposure readings with an intuitive interface designed for photographers who demand professional-grade metering capabilities. CORE FEATURES (FREE): • Real-time light metering using your device's camera • Precise aperture, shutter speed, and ISO calculations • Support for all standard camera settings • Clean, professional interface optimized for quick readings • Exposure value (EV) display with compensation controls • Camera settings reference for popular film and digital cameras • Works in any lighting condition your camera can see • Intuitive haptic feedback with "full-stop" detents for exposure drag gestures PERFECT FOR: • Film photographers seeking accurate meter readings • Digital photographers wanting precise exposure control • Studio and outdoor photography • Learning proper exposure techniques • Backup metering when your camera's meter fails PRO FEATURES (One-time $0.99 purchase): • **Spot Metering** - Professional spot metering with zoomed preview for precise exposure readings from specific areas of your scene. Drag to reposition, tap to meter. Works best on iPhones with telephoto lenses for maximum precision • Custom Step Increments - Choose between 1/3, 1/2, or full stop increments for all exposure parameters to match your camera and shooting style • Live Histogram - Real-time histogram display with RGB channel analysis for precise exposure evaluation and highlight/shadow monitoring • Preview Compensation - See exposure compensation effects directly in the camera preview to visualize over/under exposure before shooting • Custom Limits - Set personalized aperture, shutter speed, ISO, and exposure compensation limits to match your specific camera gear and preferences • Black & White Preview - Turn the camera preview into a grayscale image for helping with B&W photography The free version provides full light metering functionality suitable for most photography needs. Pro features add advanced customization and analysis tools for professional and enthusiast photographers. TECHNICAL NOTES: • Requires camera access to function as a light meter • All processing happens locally on your device • No internet connection required • Compatible with iPhone • Spot metering optimized for devices with multiple camera lenses PRIVACY: Light Meter respects your privacy. Camera data is processed locally and never stored or transmitted. No personal information is collected.

As a film photographer, I wanted an accurate yet simple reflective and incident light meter. After trying several, I decided to build my own. This light meter continuously measures light, so it requires minimal interaction during a shoot. To avoid accidentally changing film ISO, I added an ISO lock. And since I shoot often with my Hasselblad, I made EV values a core feature of the app.