# LExp - Long Exposure Calcs — Long Exposure Calculators

> Long exposure and ND filter calculators for landscape photographers. (iPhone/iPad app by Ilya Genkin Photography.)

- Source: https://appshunter.io/ios/app/lexp-long-exposure-calcs/id547000247 (this page in markdown: same URL + `.md`)
- Developer: [Ilya Genkin Photography](https://appshunter.io/developer/440193848)
- Category: Photo & Video, Utilities
- Price: $3.99
- Rating: 4.70/5 from 17 App Store ratings · 36 written reviews indexed
- Age rating: 4+
- Requires: iOS 15.6 · 22 MB
- Languages: American English
- Released: 2012-08-28
- Data updated: 2026-08-30
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/lexp-long-exposure-calcs/id547000247/reviews.md

## What is LExp?

LExp or Long Exposure Calculators is a must-have app for any landscape photographer who is shooting with ND filters or with long exposures or at night. All important calculators, reference tables and cheat sheets in one place. Select your shooting parameters and the app will do the rest for you!

CALCULATORS:
• Magic Hours for Current Location - sunrises, sunsets, twilights, golden and blue hours, and moon phases and times.
• Sunrise, sunset and sun direction for any day at any location. Instantly see how sunrise and sunset positions change throughout the year. Civil, nautical, astronomical twilight times. Elevation and azimuth of the Sun. Shadow ratio.
• Stacking ND Filters: Need to stuck multiple ND filters? It's really easy now.
• Graduated ND Filters: Not sure what Grad ND filter to use? Simply measure exposure for the sky and for the foreground and get the right answer.
• Moonlight/Nightscapes: Helps you get the right exposure for landscape photography under moonlight.
• Moon Photography: Calculates right exposure for the Moon under different conditions and focal length.
• Star-trails: Want to capture beautiful start trails? Get the right number of shots for stacking them later.
• Milky Way/non-moving stars: Helps you capturing beautiful Milky Way galaxy and starry sky without star trails.
• Velvia 50: Still shooting film and worries about reciprocity failure? This calculator is for you.
• Recalculate Exposure: From one set of ISO, aperture and shutter speed to a different set ISO, aperture and shutter speed.
• Aurora Borealis Photography: Calculates the right exposure for shooting Aurora Borealis/Australis.
• Shutter Speed Calculator for Solar Eclipses. Calculate shutter speed for different phases of solar eclipse with and without ND filters.
• Shutter Speed Calculator for Lunar Eclipses. Calculate shutter speed for different phases of lunar eclipse.

REFERENCE TABLES:
• Neutral Density ND Filters Reference Charts / Cheat Sheets
• Shooting Flowing Water Reference Charts / Cheat Sheets
• Shooting Fireworks Reference Charts / Cheat Sheets
• How to locate North and South Celestial Poles
• Useful resources and links on low-light and night photography

FEATURES:
• Built-in Timer. Some calculators have built-in timer for your convenience. It is automatically enabled when your exposure is 30 seconds or more.
• Alarm in Timer: You will be notified at 20, 10, 5 and 0 seconds when you are using countdown/timer.
• Favourite Calculator: Lock your favourite screen for quick access when you opening the application.
• Additional Info: Almost every calculator has some additional information about filters, used formulas, techniques etc. If a calculator is just a table than additional info is located below the table. 

NOTES:
• Maps require data connection.
• Please ensure that Compass in the System Settings on your device is switched ON. The app will work more accurately with it.
• The Compass accuracy can be affected by magnetic or other environmental interferences.

LIMITATIONS OF LITE VERSION:
• Only reference tables, cheat sheets and useful recourses are available.
• No timers.

SUPPORT: 
This application has been built by a photographer for photographers. Please don't hesitate to contact me if you found a bug or have a suggestion.
Your feedback is very important!

## Key features

- Magic Hours and Moon Phase Calculator
- Sunrise/Sunset Direction and Twilight Times
- ND Filter Stacking and Graduated ND Calculators
- Moonlight and Moon Photography Exposure
- Star-trails and Milky Way Astrophotography
- Reciprocity Failure and Exposure Recalculation
- Built-in Timer with Alarms

## Recent user reviews (10 of 36)

All indexed reviews: https://appshunter.io/ios/app/lexp-long-exposure-calcs/id547000247/reviews.md

### 2/5 — Version fr

*2025-03-06*

Comment puis-je obtenir et installer la version en français ?
J’attends la réponse depuis le 17 octobre 2024 😤

### 5/5 — Makes taking LE images more efficient

*2025-02-23*

Great app. Have been using this for years and has made my LE field process more efficient, effective and enjoyable. Thank you

### 2/5 — Version fr

*2024-10-17, version 3.8*

Comment puis-je obtenir et installer la version en français ?

### 5/5 — Just bought this app

*2021-11-01*

Very nicely put together with a lot of helpful tips. Hope the keep the updates coming to keep up with iOS updates

### 5/5 — Highly Useful App

*2021-09-22*

No serious landscape photographer should go on a shoot without this app.  It takes the mental gymnastics out of calculating camera adjustments necessary to achieve the best creative results using ND filters and long exposures.

### 4/5 — Language setting problem

*2020-11-27, version 3.7*

Unable to set an other language except English

### 5/5 — Nature Photographer’s Adventure Guide

*2019-10-30*

Want to photograph star trails? You need to know the settings for your camera. This app is where you will find them. An intuitive interface gives you the calculations for all kinds of nature subjects such as aurora photography, and lunar imaging. Now all you need is a reliable camera, proper clothing, and a sense of adventure.

### 5/5 — Great Landscape/Night Photography App

*2018-12-29*

LExp is an exceptional photography tool that provides a series of handy calculators to optimize camera settings for a variety of landscape, nighttime and tripod-based captures.  The app is extremely easy to use and for less experienced photographers, provides well-written documentation and explanations of the features and function of each calculator.  Even though I know most of the rules covered by the app, the calculators include a number of additional elements that are camera (e.g., high-res) or condition (moon shots in clear vs. hazy conditions) specific to optimize your exposures.
Would love to see an Android version for my phone and auto-rotate for the app since I typically use my iPad on a keypad stand.

### 5/5 — Great app

*2018-10-06*

I recently invested considerable sum into the Lee filter system for my Nikon D850. This app is a perfect match, allowing me to quickly calculate proper exposure for various filter combinations. While I have yet to shoot in the field since getting all my filters, I've played with the app enough to know it will be quite handy. It also got a recent update, so its nice to know development is active.

### 5/5 — Thank you!

*2018-06-20*

Thank you so much!
The best!

Спасибо, Илья, давно хотел взять твою программу, все что то было не до того. Сейчас посмотрел твой сайт, ещё раз порадовался за нужный софт.
Спасибо!

## Frequently asked questions about LExp

### What does LExp - Long Exposure Calcs do?

LExp is a photography app designed to assist landscape photographers with long exposure and ND filter calculations. It offers a comprehensive suite of tools, including calculators for magic hours, sun direction, filter stacking, astrophotography, and more, all in one convenient place.

### What are the key features of this app?

Key features include calculators for magic hours, sun direction, various ND filter scenarios, moonlight and moon photography, star-trails, and Milky Way capture. It also offers reciprocity failure calculations, exposure recalculation, and a built-in timer with alarms for exposures over 30 seconds.

### How much does LExp - Long Exposure Calcs cost?

The application is a paid app, meaning there is an upfront cost to purchase and download it from the app store. There are no in-app purchases or advertisements mentioned in the provided description.

### Is this app compatible with my device?

The description does not specify exact compatibility requirements. However, it notes that map features require a data connection and that compass accuracy is improved when the device's compass is enabled in system settings. It is likely designed for modern smartphones and tablets.

### What are common use cases for this app?

Common use cases include calculating the correct exposure for shooting with multiple ND filters stacked together, determining the right graduated ND filter for balancing sky and foreground exposures, planning astrophotography sessions for star-trails or the Milky Way, and managing long exposures for flowing water or night scenes.

## Version history (last 5 releases)

### 3.11 — 2025-12-21

• Minor bug fix

### 3.10 — 2025-06-08

• 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.

### 3.9 — 2025-03-04

- New Calculator: Lunar Eclipse.
- Support for iOS 18.
- Minor bug fixes.

### 3.8 — 2023-12-28

- Support for the latest iOS.
- Bug fixes for Back and Done buttons.

### 3.7 — 2020-07-11

- Support for the latest iOS.
- Minor bug fix.

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## More apps by Ilya Genkin Photography

- [Long Exposure Lite](https://appshunter.io/ios/app/long-exposure-lite/id933583440)

All apps by Ilya Genkin Photography: https://appshunter.io/developer/440193848

## Related topics

[star exposure calculator](https://appshunter.io/ios/topics/star-exposure-calculator) · [long exposure buddy](https://appshunter.io/ios/topics/long-exposure-buddy) · [neewer view](https://appshunter.io/ios/topics/neewer-view) · [36exp](https://appshunter.io/ios/topics/36exp) · [long exposure calculator](https://appshunter.io/ios/topics/long-exposure-calculator) · [long exposure lite](https://appshunter.io/ios/topics/long-exposure-lite)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-30.*