About ExposureLab: Photo Calculator
ExposureLab is the essential exposure calculator toolkit for serious photographers. Whether shooting long exposures with ND filters, capturing the Milky Way, or working with film, ExposureLab provides professional-grade calculations instantly, completely offline.
CORE FEATURES
ND Filter Calculator with Timer
Calculate precise shutter speeds for single or stacked ND filters. Stack any combination of ND2, ND4, ND8, ND64, ND1000, and custom values. Get instant results for landscape photography, waterfall shots, and motion blur effects. Tap Start Timer to begin a countdown with the calculated exposure time. Large display with vibration and sound alerts ensures perfect timing. Save favorite filter combinations as presets.
Exposure Converter
Master equivalent exposures while maintaining consistent exposure values. Change aperture, shutter speed, or ISO and instantly see all equivalent combinations. Essential for adapting to lighting constraints and creative control. Perfect for understanding exposure relationships.
Film Reciprocity Calculator with Timer
Accurate reciprocity failure corrections for popular film stocks including Kodak Portra 160/400/800, Kodak Ektar 100, Ilford HP5 Plus, Ilford Delta 100/400/3200, Ilford FP4 Plus, and Fuji Acros 100. Get corrected exposure times for long exposures exceeding one second. Start Timer feature counts down the corrected exposure with alerts.
Astrophotography Calculator
Calculate maximum shutter speed to avoid star trails using three proven methods: the 250 Rule optimized for modern high-resolution cameras, the traditional 300 Rule for conservative results, and the advanced Best Rule that accounts for your specific lens aperture and sensor pixel size for optimal accuracy. Inspired by the work of Frédéric Michaud and the astrophotography community.
Presets Manager
Organize and access favorite configurations instantly. Save filter stacks, exposure combinations, and astro profiles. Free version includes 1 preset per tool (3 total). Pro version offers unlimited presets.
DESIGNED FOR FIELD USE
Works Completely Offline
All calculations happen on-device with no internet required. Reliable in remote locations without cellular or WiFi coverage. Your data stays private and secure on your device.
Night Mode
Special ultra-dark interface with red and low-blue colors preserves night vision during astrophotography and night shoots. Toggle instantly from any screen. Perfect for maintaining dark adaptation while checking calculations.
iPhone and iPad Optimized
Beautiful adaptive layouts designed specifically for both devices. Full multitasking support on iPad. Landscape and portrait orientation support. Optimized for one-handed use in the field.
Integrated Timer System
Built-in countdown timer launches directly from ND Filter and Film Reciprocity calculators. Large easy-to-read display. Keep screen awake option. Customizable vibration and sound alerts. No need to switch between apps during long exposures.
EXPOSURELAB PRO
Upgrade with a one-time purchase for advanced features.
Unlimited Presets - Save as many configurations as needed for multiple camera bodies and shooting scenarios.
Advanced Film Database - Extended library with custom reciprocity curve adjustments.
Export and Import Settings - Backup all presets and configurations.
PERFECT FOR
Landscape photographers calculating ND filter exposures for silky water and cloud movement. Astrophotographers preventing star trails and achieving pinpoint stars. Film photographers correcting for reciprocity failure during long exposures. Professional photographers needing reliable calculations in remote locations.
PRIVACY AND SECURITY
No login needed. All data stored locally on your device. Works completely offline. No analytics or tracking. Your settings stay completely private.
Download ExposureLab today and take control of your exposure calculations. Professional accuracy trusted by working photographers.
CORE FEATURES
ND Filter Calculator with Timer
Calculate precise shutter speeds for single or stacked ND filters. Stack any combination of ND2, ND4, ND8, ND64, ND1000, and custom values. Get instant results for landscape photography, waterfall shots, and motion blur effects. Tap Start Timer to begin a countdown with the calculated exposure time. Large display with vibration and sound alerts ensures perfect timing. Save favorite filter combinations as presets.
Exposure Converter
Master equivalent exposures while maintaining consistent exposure values. Change aperture, shutter speed, or ISO and instantly see all equivalent combinations. Essential for adapting to lighting constraints and creative control. Perfect for understanding exposure relationships.
Film Reciprocity Calculator with Timer
Accurate reciprocity failure corrections for popular film stocks including Kodak Portra 160/400/800, Kodak Ektar 100, Ilford HP5 Plus, Ilford Delta 100/400/3200, Ilford FP4 Plus, and Fuji Acros 100. Get corrected exposure times for long exposures exceeding one second. Start Timer feature counts down the corrected exposure with alerts.
Astrophotography Calculator
Calculate maximum shutter speed to avoid star trails using three proven methods: the 250 Rule optimized for modern high-resolution cameras, the traditional 300 Rule for conservative results, and the advanced Best Rule that accounts for your specific lens aperture and sensor pixel size for optimal accuracy. Inspired by the work of Frédéric Michaud and the astrophotography community.
Presets Manager
Organize and access favorite configurations instantly. Save filter stacks, exposure combinations, and astro profiles. Free version includes 1 preset per tool (3 total). Pro version offers unlimited presets.
DESIGNED FOR FIELD USE
Works Completely Offline
All calculations happen on-device with no internet required. Reliable in remote locations without cellular or WiFi coverage. Your data stays private and secure on your device.
Night Mode
Special ultra-dark interface with red and low-blue colors preserves night vision during astrophotography and night shoots. Toggle instantly from any screen. Perfect for maintaining dark adaptation while checking calculations.
iPhone and iPad Optimized
Beautiful adaptive layouts designed specifically for both devices. Full multitasking support on iPad. Landscape and portrait orientation support. Optimized for one-handed use in the field.
Integrated Timer System
Built-in countdown timer launches directly from ND Filter and Film Reciprocity calculators. Large easy-to-read display. Keep screen awake option. Customizable vibration and sound alerts. No need to switch between apps during long exposures.
EXPOSURELAB PRO
Upgrade with a one-time purchase for advanced features.
Unlimited Presets - Save as many configurations as needed for multiple camera bodies and shooting scenarios.
Advanced Film Database - Extended library with custom reciprocity curve adjustments.
Export and Import Settings - Backup all presets and configurations.
PERFECT FOR
Landscape photographers calculating ND filter exposures for silky water and cloud movement. Astrophotographers preventing star trails and achieving pinpoint stars. Film photographers correcting for reciprocity failure during long exposures. Professional photographers needing reliable calculations in remote locations.
PRIVACY AND SECURITY
No login needed. All data stored locally on your device. Works completely offline. No analytics or tracking. Your settings stay completely private.
Download ExposureLab today and take control of your exposure calculations. Professional accuracy trusted by working photographers.
