📸 ExposureLab

ExposureLab - Professional Photography Exposure Toolkit

The ultimate exposure calculator toolkit for photographers. Master long exposures, ND filters, film reciprocity, astrophotography, and more. Designed for both field work and studio use with special Night Mode for preserving night vision.

🔒 Fully Offline • Complete Privacy

ExposureLab works completely offline with no internet connection required. Your settings, presets, and data stay 100% private and secure on your device. No login, no account, no cloud sync - complete control over your data.

Core Photography Tools

🌄 ND Filter Calculator FREE

Calculate adjusted shutter speeds for ND filter stacks. Stack multiple filters (ND8, ND64, ND1000, etc.) and get instant calculations. Includes integrated countdown timer with vibration and sound alerts for timing your long exposures. Save your favorite filter combinations as presets.

⚖️ Exposure Converter FREE

Calculate equivalent exposures maintaining the same exposure value (EV). Change aperture, shutter speed, or ISO and instantly see equivalent settings. Essential for creative control.

🎞️ Film Reciprocity Calculator FREE

Accurate reciprocity failure corrections for popular film stocks including Kodak Portra, Ilford HP5, Ilford Delta, Fuji Acros, and more. Get corrected exposure times for long exposures. Built-in countdown timer helps you precisely time the corrected exposures.

🌌 Astrophotography Calculator FREE

Calculate maximum shutter speed to avoid star trails using the 250 Rule, 300 Rule, and advanced Best Rule method. The Best Rule accounts for your specific lens aperture and sensor pixel size for optimal accuracy. Optimized for modern high-resolution sensors.

Inspired by the pioneering work of Frédéric Michaud and the astrophotography community.

💾 Presets Manager FREE

Save and organize your favorite filter stacks, timer settings, and exposure combinations. Quick access to frequently used configurations in the field.

Free vs Pro Features

ExposureLab offers all core calculation tools for free. Upgrade to ExposureLab Pro (one-time purchase) to unlock advanced features and remove limits.

✅ FREE FEATURES

  • All 4 core calculation tools
  • ND Filter Calculator with integrated timer
  • Exposure Converter
  • Film Reciprocity Calculator with timer
  • Astrophotography Calculator (250/300/Best Rules)
  • 1 saved preset per tool (3 total)
  • Night Mode for low-light use
  • Works completely offline
  • No login required

👑 PRO FEATURES PRO

  • Unlimited Presets - Save as many filter stacks and settings as you need
  • Educational Content - Detailed explanations of the 250, 300, and Best Rules with practical recommendations
  • Advanced Film Database - Extended film stock library with custom curves
  • Export/Import Settings - Backup and restore your presets

One-time purchase • Lifetime access

Why Choose ExposureLab?

🔴 Works Offline

No internet required. All calculations happen on-device for instant results in any location.

🌙 Night Mode

Special ultra-dark interface with red/low-blue colors to preserve night vision during astrophotography and night shoots.

📱 iPhone & iPad Optimized

Beautiful adaptive layouts designed specifically for both iPhone and iPad with full multitasking support.

⚡ Fast & Accurate

Instant real-time calculations with professional-grade accuracy. No waiting, no connectivity issues.

🎯 Field-Tested

Built by photographers, for photographers. Every tool is designed for real-world shooting scenarios.

💎 Fair Pricing

Core tools free forever. One-time Pro purchase with no subscription or recurring fees.

Perfect For:

  • Landscape Photographers - ND filter calculations and long exposure timing
  • Astrophotographers - Star trail prevention calculations with multiple methods
  • Film Photographers - Reciprocity failure corrections for various film stocks
  • Long Exposure Artists - Precise timing and exposure equivalents
  • Photography Students - Learn exposure relationships hands-on
Download on the App Store