LExp - Long Exposure Calcs 4+

Long Exposure Calculators

Ilya Genkin Photography

Designed for iPhone

    • 4.7 • 17 Ratings
    • $3.99

iPhone Screenshots


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!

• 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.

• 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

• 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.

• 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.

• Only reference tables, cheat sheets and useful recourses are available.
• No timers.

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!

What’s New

Version 3.8

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

Ratings and Reviews

4.7 out of 5
17 Ratings

17 Ratings

SDTravel ,

Great app

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.

Kjljxybr ,

Must have!

Not just a calculator. Excellent multitool with lots of professional tools for many photo/video needs. Important - each instrument has own very informative and helpful HELP menu, as well as a learning base. Beside that - quick, professional and friendly customer support. Highly recommended and huge respect to authors and developers!

SF Presidio ,

Nature Photographer’s Adventure Guide

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.

App Privacy

The developer, Ilya Genkin Photography, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy.

Data Not Collected

The developer does not collect any data from this app.

Privacy practices may vary, for example, based on the features you use or your age. Learn More


  • Family Sharing

    Up to six family members can use this app with Family Sharing enabled.

More By This Developer

You Might Also Like

Photographer's Friend
Photo & Video
Photo & Video
ND Filter Pro Calculator
Photo & Video
Long Exposure Calculator
Photo & Video
Mango Exposure: The Calculator
Photo & Video
Photo & Video