# Long Exposure Calculator (Camera:How to do star trail photography.) > Long exposure photography calculator for precise time settings. (iPhone/iPad app by Masami Koya.) - Source: https://appshunter.io/ios/app/long-exposure-calculator-camerahow-to-do-star-trail-photography/id500071356 (this page in markdown: same URL + `.md`) - Developer: [Masami Koya](https://appshunter.io/developer/1200335398) - Category: Photo & Video, Utilities - Price: $3.99 - Rating: 2.40/5 from 5 App Store ratings · 5 written reviews indexed - Age rating: 4+ - Requires: iOS 6.0 · 8 MB - Languages: English - Released: 2012-02-10 - Data updated: 2026-06-10 - Monetization: paid - User reviews in markdown: https://appshunter.io/ios/app/long-exposure-calculator-camerahow-to-do-star-trail-photography/id500071356/reviews.md ## What is Long Exposure Calculator (Camera? 1:This application is a long time exposure calculator which is useful for both beginners and professionals. 2:Learn how to do simple long exposure, like star trail photography. (Preparation / Focus / Long Time Exposure) If it is short-time (1 to 30 seconds) exposure, it is not necessary to calculate. Because,the optimal exposure is acquired by the photograph is taken several times. On the other hand,stellar orbital photography,night photography,etc. have the necessity of taking a photograph for 30 minutes or more when you take a photo of long time exposure. This application can calculate the required exposure time by inputting a standard value (F-value,ISO-value, and the number of seconds), and a preset value (F-value,ISO-value). Like I said before, this application was made for the practical function of long time exposure photography that everyone can use if they have the right equipment. Please take advantage of this application and enjoy great a long time exposure photography. ■2016.02 F-value bug fix. ------------------------- ■World Review Great! ⋆⋆⋆⋆⋆ Very useful application! I only miss a timer and the time with a nd-filter but hey, it's free and great made! great ⋆⋆⋆⋆⋆ and usefull app ! very simple to calculate the needed exposure time . ## Key features - Long exposure time calculation - Star trail photography guide - Night photography settings - Input standard and preset values - Useful for beginners and professionals ## Recent user reviews (5 of 5) All indexed reviews: https://appshunter.io/ios/app/long-exposure-calculator-camerahow-to-do-star-trail-photography/id500071356/reviews.md ### 1/5 — No f stop *2015-10-03, version 1.0* Won't let me click the f/stop option making it completely useless. Waste of money. ### 1/5 — Just calculator!! *2014-04-15, version 1.0* Just calculator!! Don't need this kind of app. Save your money and time. Want my money back. ### 1/5 — Horrible *2013-08-29, version 1.0* Written with broken English, and it's a bit glitchy. The calculator is stupid and worthless. It doesn't let you go beyond seconds, and it doesn't let you program in a desired shutter speed.... I want my money back 👎 ### 4/5 — works well *2012-06-18, version 1.0* but man this app is too pricey.it's a math formula after all. 99 cents would have been enough. I hoped to see pics and examples for that price. Slight rip off.... ### 5/5 — Seems to work great and simple to use! *2012-06-10, version 1.0* Great app! ## Frequently asked questions about Long Exposure Calculator (Camera ### What is Long Exposure Calculator used for? Long Exposure Calculator is used to determine the precise exposure times needed for long exposure photography, such as capturing star trails or night scenes. It helps users calculate required settings based on standard and preset values. ### Is Long Exposure Calculator suitable for beginners? Yes, the application is designed to be useful for both beginners and professionals. It provides guidance on how to perform simple long exposures and calculate necessary settings. ### What kind of photography does Long Exposure Calculator support? This app specifically supports long time exposure photography, including techniques like star trail photography and general night photography where exposures can last 30 minutes or more. ### What information do I need to input into Long Exposure Calculator? You need to input standard values such as F-value, ISO-value, and the number of seconds. You can also input preset values for F-value and ISO-value to refine the calculation. ### How much does Long Exposure Calculator cost? Long Exposure Calculator is a paid application, priced at $3.99. This price provides access to its full functionality without additional in-app purchases. ### On which devices can I use Long Exposure Calculator? Long Exposure Calculator is available for iPhone, iPad, and iPod touch devices, and is also supported on Apple Watch. It is compatible with iOS devices. ### How often is Long Exposure Calculator updated? The app was last updated on March 1, 2016, with version 1.3. Previous updates include bug fixes, such as an F-value bug fix in February 2016. ### What is the user sentiment for Long Exposure Calculator? User reviews indicate positive sentiment, with comments like 'Great!' and 'Very useful application!' Users appreciate its simplicity and utility for calculating exposure times, though some have suggested additional features like a timer. ## Version history (last 1 release) ### 1.3 — 2016-03-01 This app has been updated by Apple to display the Apple Watch app icon. Layout Fix. ## Apps similar to Long Exposure Calculator (Camera | App | Rating | Price | Category | | --- | --- | --- | --- | | [FinderCam with Plate Solving](https://appshunter.io/ios/app/findercam-with-plate-solving/id1541018483) | 2.5 (2) | Free | Photo & Video | | [Field Tools](https://appshunter.io/ios/app/field-tools/id305817254) | 4.9 (8) | Free | Photo & Video | | [LightTrac](https://appshunter.io/ios/app/lighttrac/id392892355) | 4.7 (367) | Free | Photo & Video | | [Yosemite Photographer's Guide](https://appshunter.io/ios/app/yosemite-photographers-guide/id459969580) | 4.7 (25) | $6.99 | Photo & Video | | [LExp - Long Exposure Calcs](https://appshunter.io/ios/app/lexp-long-exposure-calcs/id547000247) | 4.7 (17) | $3.99 | Photo & Video | | [Video Speed Editor - VBooster](https://appshunter.io/ios/app/video-speed-editor-vbooster/id1065354746) | 4.8 (141) | Free | Photo & Video | ## More apps by Masami Koya - [NDFilter Calculator&Sheet (Long Time Exposure Photography)](https://appshunter.io/ios/app/ndfilter-calculator-and-sheet-long-time-exposure-photography/id560877288) All apps by Masami Koya: https://appshunter.io/developer/1200335398 --- *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 2026-06-10.*