# NDCalculator — Exposure Time Calculator > ND filter exposure time calculator for long exposure photography. (iPhone/iPad app by Frank Fiebig.) - Source: https://appshunter.io/ios/app/ndcalculator/id1490264475 (this page in markdown: same URL + `.md`) - Developer: [Frank Fiebig](https://appshunter.io/developer/1490264474) - Category: Photo & Video, Utilities - Price: Free - Rating: 3.00/5 from 2 App Store ratings · 3 written reviews indexed - Age rating: 4+ - Requires: iOS 13.1 · 1 MB - Languages: American English, German (Germany) - Released: 2019-12-05 - Data updated: 2026-06-10 - Monetization: free - User reviews in markdown: https://appshunter.io/ios/app/ndcalculator/id1490264475/reviews.md ## What is NDCalculator? With this calculator you can calculate your camera exposure times when using a ND filter to create beautiful long exposures. ## Key features - ND filter exposure time calculation - Long exposure photography tool - Simplified exposure adjustments - Creative photography effects ## Recent user reviews (3 of 3) All indexed reviews: https://appshunter.io/ios/app/ndcalculator/id1490264475/reviews.md ### 1/5 — Simply doesn't work at all *2023-03-14* Doesn't matter what shutter speed or ND filter density is set the shutter speed at the top of the page always says 00.00.00 If you tap the timer it just keeps counting up until you stop it. And even if it did work the shutter speed settings wheel is too coarse. It goes in 1 stop increments (1/400, 1/2000, 1/1000 etc) so if you have a shutter speed of let's say 1/1600 or 1/1200 you would just have to take a nearest guess. But as it doesn't work at all I guess this is irrelevant. ### 1/5 — Can’t see shutter times and most ND Filter size *2022-03-21* iPhone 10 user. Can’t see the numbers nor can you tap in more than 12 stop filter. I use more than that if during the day and trying to smooth water. I like the timer function and wonder why all ND apps don’t have this option. Any exposure over 30 seconds a timer is a must. **Developer response:** Thanks for the feedback. The new upcomming version will have some improvements in the select dropdowns and added two more filter options. Maybe you'll give it another try. ### 5/5 — Easy, simple *2020-10-01* Little confused at first with the interface but then I saw the “How to” tab. Followed instructions and it was super easy from there. Love the timer - super helpful for those of us using bulb mode **Developer response:** Thanks for the feedback. Glad you enjoying using it. Calculation and timer was a must for me, thats why i created the app in the first place. ## Frequently asked questions about NDCalculator ### What is NDCalculator used for? NDCalculator is used to calculate camera exposure times when you are using an ND (Neutral Density) filter. This is essential for achieving correct exposures during long exposure photography. ### Is NDCalculator free to use? Yes, NDCalculator is available for free. It does not require any payment to download or use its core functionality. ### What devices does NDCalculator support? NDCalculator is designed for Apple devices, supporting iPhone, iPad, and iPod. ### How often is NDCalculator updated? The latest version of NDCalculator was released on December 12, 2025, indicating recent development activity. The app was initially released on December 5, 2019. ### What is the age rating for NDCalculator? NDCalculator has an age rating of 4+, making it suitable for users of all ages. ### Does NDCalculator have ads? No, NDCalculator does not contain advertisements. Users can enjoy the app without interruptions from ads. ### What is the user rating for NDCalculator? NDCalculator has a user rating of 3.0 stars based on 2 ratings. This suggests a mixed but limited user reception. ## Version history (last 5 releases) ### 1.4.1 — 2025-12-12 change preview images ### 1.4 — 2025-12-10 timer update settings update ergonomics enhanced ### 1.3.3 — 2025-12-05 text changes timer bugfix ### 1.3 — 2025-12-04 2 more densities bug fixes and code upgrades ### 1.2 — 2019-12-20 translation changes --- *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.*