LExp: Landscape Photography4.3 - App Store

Great landscape photographs start before you press the shutter.

LExp helps you be in the right place when the light is right - and get the exposure right when it happens.

Plan sunrise and sunset, find golden and blue hour, check photographic conditions, track the Sun, calculate long exposures, work with ND filters, photograph the Moon and night sky, plan star trails and eclipses - all from one photography toolkit built for landscape photographers.

PLAN THE LIGHT
* Magic Hours - sunrise, sunset, golden hour, blue hour, civil, nautical and astronomical twilight, moonrise, moonset and Moon phase.
* Sun Tracker - see where the Sun rises and sets for any date and location, with solar direction, elevation and azimuth.
* SkyMeter Forecast - A 48-hour photographic weather forecast with intelligent sunrise and sunset colour potential prediction, cloud layers, fog, wind, photographer-focused conditions and more.

GET THE EXPOSURE RIGHT
* ND Filter Stacking - calculate the correct exposure when combining multiple ND filters.
* Graduated ND Filters - measure the difference between sky and foreground and choose the appropriate GND strength.
* Recalculate Exposure - quickly convert between ISO, aperture and shutter-speed combinations.
* Moonlight & Nightscapes - exposure guidance for landscapes photographed under moonlight.
* Moon Photography - calculate exposure for the Moon based on phase, conditions, focal length and camera settings.
* Milky Way & Still Stars - find the longest practical shutter speed while keeping stars sharp.
* Star Trails - calculate the number of frames required for the trail length you want.
* Aurora Photography - exposure guidance for photographing the Aurora Borealis and Aurora Australis.
* Solar Eclipse Photography - calculate shutter speeds for different phases of a solar eclipse.
* Lunar Eclipse Photography - exposure guidance throughout the phases of a lunar eclipse.
* Velvia 50 Reciprocity - compensate for reciprocity failure when shooting Fujifilm Velvia 50.

USEFUL TOOLS IN THE FIELD
* Built-in long-exposure timer where supported.
* Countdown alerts during long exposures.
* ND filter reference charts and cheat sheets.
* Flowing-water shutter-speed guide.
* Fireworks photography reference guide.
* Guide to locating the North and South Celestial Poles.
* Additional photography notes, formulas and shooting advice throughout the app.

BUILT FOR PHOTOGRAPHERS

LExp is designed around real landscape and night-photography workflows: fast access to the information you need, without digging through generic weather data or doing calculations in your head.

Whether you're waiting for sunrise, stacking ND filters beside a waterfall, photographing the Milky Way or preparing for an eclipse, LExp helps you spend less time calculating and more time making photographs.

SkyMeter Forecast and selected advanced features require LExp Premium.

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Privacy Policy: https://lexp.co/privacy
Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Version History * Bug fixes for daylight saving in Magic Hour and SkyMeter Forecast. 4.3 Oct 4 * Updated descriptions, reference information, and illustrations across all calculators for clearer and more useful in-app guidance.
* Modernized Sun Tracker for improved layout and compatibility with Safe Area, Dynamic Island, and the latest iPhone displays.
* Bug fixes and general improvements. 4.2 Sep 27 * Improved the Sky Colour Index (SCI) algorithm for more accurate 48-hour SkyMeter Forecast ratings, including better handling of changing conditions around sunrise and sunset.
* Updated calculator descriptions, reference information, and illustrations.
* Optimized for iOS 27 and the latest iPhone displays, with additional bug fixes and improvements. 4.1 Sep 21 * New SkyMeter Forecast - see the photographic potential for upcoming sunrises and sunsets with a 48-hour forecast, Sky Colour Index, cloud layers and detailed conditions.
* Completely redesigned interface across LExp, with clearer results, faster inputs and improved readability.
* Calculators, reference charts and information screens have been refreshed for a more consistent experience.
* Optimized for iOS 26 and the latest iPhone displays, with additional bug fixes and improvements. 4.0 Sep 15 • Minor bug fix 3.11 12/21/2025 • New Calculator: Magic Hours for Current Location - sunrises, sunsets, twilights, golden and blue hours, and moon phases and times.
• Support for iOS 18.5.
• Minor bug fixes. 3.10 06/08/2025 - New Calculator: Lunar Eclipse.
- Support for iOS 18.
- Minor bug fixes. 3.9 03/04/2025 - Support for the latest iOS.
- Bug fixes for Back and Done buttons. 3.8 12/28/2023 - Support for the latest iOS.
- Minor bug fix. 3.7 07/11/2020 - Minor bug fix. 3.6 04/19/2020 - Support for iOS 13.
- Support for iPhone 11, 11 Pro and 11 Pro Max.
- Minor cosmetic changes in the design. 3.5 09/25/2019 - Support for iOS 12.
- Support for iPhone X, Xr, Xs and Xs Max. 3.4 01/27/2019 - Fireworks reference table update. 3.3 01/24/2018 - Support for iOS 11.
- Bug fix for 'Resources and Links' page app crash. 3.2 10/05/2017 - Updated Solar Eclipse calculator with Sun size in photo frame.
- New reference tables for ND filters.
- Minor bug fixes. 3.1 07/24/2017 'GREAT AMERICAN SOLAR ECLIPSE 2017' EDITION

* Shutter Speed Calculator for Solar Eclipses.
* Sunrise, sunset and sun direction for any day at any location.

Key features:
- Instantly see how sunrise and sunset positions change throughout the year.
- Civil, nautical, astronomical twilight times.
- Elevation and azimuth of the Sun.
- Shadow ratio.
- Calculate shutter speed for different phases of solar eclipse with and without ND filters. 3.0 07/17/2017 - Updated: Still Stars / Milky Way Calculator;
- Updated: Recalculate Exposure Calculator;
- New Resources. 2.7 06/19/2017 - New calculator: Aurora Borealis;
- New calculator: Moon Photography;
- Updated: Still Stars / Milky Way Calculator;
- New Resources. 2.6 09/13/2016 - Bug fix for iPod Touch black screen. 2.5 05/02/2016 - New calculator - Recalculate Exposure;
- Stacking ND filters calculator has been updated with exposure compensation;
- Timers now work in background;
- Vibration in timers;
- Zooming in ND Filters reference chars;
- ND Filters reference chars up to 20-Stop Filters;
- New resources;
- Bug fix for iPhone 6 Plus screen. 2.4 03/22/2016 - New modern flat interface;
- Supports iOS 8 and large screens;
- New resources;
- Miscellaneous bug fixes. 2.3 11/04/2014 - New resources;
- Updated ND Filters Calculator and Tables: Support for 15-Stop Singh-Ray Mor-Slo filter. 2.2 11/12/2013 - New Feature: Access settings from the application;
- New Feature: Lock your favourite screen for quick access;
- New Feature: Alarm notifications for countdown/timer;
- New resources;
- Updated Calculator: Longer exposures for Velvia 50 Reciprocity Failure;
- Updated Calculator: Disable/enable filters for Velvia 50 Reciprocity Failure. 2.1 06/04/2013 - Bug Fix: Application crashes when copying to the clipboard;
- Bug Fix: Broken user interface on iPhone 5;
- New Feature: iPhone 5 with 4" Retina display support;
- New Feature: Reset/keep calculators' input values;
- New resources;
- New Calculator: Velvia 50 Reciprocity Failure;
- New Calculator: Graduated ND Filters;
- Updated Calculator: Visual simulation for Star Trails. 2.0 02/27/2013 - New ND Filters reference tables
- New resources 1.2 11/30/2012