ExposureLab: ND & Golden Hour

ExposureLab is the complete field toolkit for serious photographers. Plan golden hour, calculate ND filter exposures, correct for film reciprocity, and shoot the Milky Way — all in one app. No subscriptions. No ads. No account. Works fully offline.

CORE FEATURES

Golden Hour Planner
Plan every shoot with astronomical precision. Get exact times for sunrise, sunset, blue hour, golden hour, and civil, nautical, and astronomical twilight at your location. Sunrise and sunset are free; all other phases unlock with Pro. Calculated entirely on-device — no internet, no account, no tracking. Your location never leaves your phone. Essential for landscape, portrait, wedding, and travel photographers.

ND Filter Calculator with Timer
Calculate precise shutter speeds for single or stacked ND filters. Stack any combination of ND2, ND4, ND8, ND16, ND32, ND64, ND1000, and custom values. Instant results for silky waterfalls, smooth seas, and motion-blurred clouds. Built-in countdown timer with vibration and sound alerts ensures perfect timing. Save favorite filter combinations as presets.

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 NPF Rule that factors your specific lens aperture and sensor pixel size for pinpoint stars. Includes presets for OM System OM-1 II, Nikon Z8/Z9, Canon R3, and many more. Inspired by the work of Frédéric Michaud and the astrophotography community.

Film Reciprocity Calculator with Timer
70 professional film stocks with accurate reciprocity failure corrections — including Kodak Portra 160/400/800, Kodak Ektar 100, Kodak Ektachrome E100, CineStill 400D, Harman Phoenix 200, Ilford HP5 Plus, Ilford Delta 100/400/3200, Ilford FP4 Plus, Ilford SFX 200, Ilford Ortho Plus 80, Fuji Acros 100, and Lomography Color 200. Get corrected exposure times for exposures over one second, with an integrated countdown timer.

Exposure Converter
Master equivalent exposures. Change aperture, shutter speed, or ISO and instantly see every equivalent combination. Perfect for adapting to lighting constraints and understanding exposure relationships from the inside out.

Share As Card
Every calculator generates a clean, shareable card with your results. Post to Instagram, send to a collaborator, or save to your notes. Looks great in every language.

Presets Manager
Save and access favorite configurations instantly — filter stacks, exposure combinations, astro profiles. Free version includes 1 preset per tool. Pro unlocks unlimited presets.

DESIGNED FOR FIELD USE

Works Completely Offline
Every calculation runs on-device. Reliable in remote locations with no cellular or WiFi. Your data stays on your phone.

Night Mode
Ultra-dark interface with red and low-blue colors preserves night vision during astrophotography and dawn shoots. Toggle instantly from any screen.

Integrated Timer System
Countdown timers built directly into ND Filter and Film Reciprocity calculators. Large, readable display. Keep-screen-awake option. Customizable vibration and sound alerts. No switching apps mid-exposure.

EXPOSURELAB PRO
One-time purchase. No subscription, ever.
All Golden Hour Planner phases (blue hour, golden hour, full twilight data)
Full 58-stock film library with custom reciprocity curves
Unlimited presets across every tool
Extended aperture and ISO range in the Exposure Converter
Educational guides in every tool

PERFECT FOR
Landscape photographers chasing silky water and dramatic skies. Astrophotographers capturing the Milky Way. Film photographers shooting long exposures. Travel photographers needing reliable tools without connectivity.

PRIVACY AND SECURITY
No login. No account. No tracking. No analytics. No ads. All data stored locally on your device. All calculations run offline. Your location, presets, and settings stay completely private.