# NDCalc2

> ND filter calculator for photography exposure time adjustments. (iPhone/iPad app by Boris Nienke.)

- Source: https://appshunter.io/ios/app/ndcalc2/id822835884 (this page in markdown: same URL + `.md`)
- Developer: [Boris Nienke](https://appshunter.io/developer/300699195)
- Category: Photo & Video, Utilities
- Price: $0.99
- Rating: 1.50/5 from 2 App Store ratings · 2 written reviews indexed
- Age rating: 4+
- Requires: iOS 7.0 · 20 MB
- Languages: American English, German (Germany)
- Released: 2014-02-24
- Data updated: 2026-08-24
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/ndcalc2/id822835884/reviews.md

## What is NDCalc2?

Screenshots are german but it's translated to english too. 

This is a completely rewritten Version of NDCalc - now called NDCalc2. It's all new with these great features:
- build for iOS7
- supports the 4" Screens of iPhone5/s/c
- supports retina
- Much more comfortable selection of shutter speed and NDFilter (no wheel control)
- Multi-Select! Finally! You can switch to Multi-Select-Mode with a single tap in the toolbar if you are a ND-Filter-Stacker like myself :) Just activate Multi-Select-Mode and tap on any Filter you have stacked to the lens for really long exposures.
- Add your own Filters! Finally! You own a filter which is not listed in the default list? Just add it by f-stops, ND-Value or Factor.
- Delete Filters. Just delete all filters you don't own and make selecting filters much more convenient
- Reorder Filter. Order the Filter-List as you like it. Bring up the most used filters to the top of the list.

The core function is still the same as NDCalc:

You know the time without the filter -how long do you need to exp. WITH filter? Sounds easy but tell me quickly how long to exp. with an ND 1.8 if the time without filter is 1/320? 

Now you can! 

Set Filter and exp. time without the filter and you can see the correct time. In the example above 1/5 

Even easier it shows you 5 because this is what you can set on a dSLR. Smaller letters showing you the actual time. For 12500'' it shows, that these are 3h, 28m and 20s. 

For times of 4+ seconds you get a countdown button to easily stop longer exposures manually with a remote shutter release with alarm and vibration (if supported).

## Key features

- Calculate exposure time with ND filters
- Supports iPhone 5/s/c screens
- Multi-Select Mode for filter stacking
- Add custom ND filters
- Delete and reorder filters
- Countdown timer for long exposures

## Recent user reviews (2 of 2)

All indexed reviews: https://appshunter.io/ios/app/ndcalc2/id822835884/reviews.md

### 1/5 — Crashes

*2016-09-02*

When you add a filter and then go to use it the app crashes.

### 1/5 — Waste of money - bugs galore for such a simple app

*2014-10-30*

I can't believe I wasted a whole 69p purchasing this app. On first use, after adding a new filter the app crashed, when selecting a shutter speed/filter combination, if you happen to select more than one filter (I don't think it should let you do that anyway) and the exposure time is over a certain amount the app crashes, need I say anymore?  This is easily fixed by using a simple if statement to check the exposure value (if you really want to allow the user to select more than one filter).

Then when you tap on the Start button, you don't even show a countdown timer, just a progress bar. For this, the progress bar is pointless as it doesn't tell me how many seconds of the exposure are remaining.

Come on, put some real thought into an app you are charging for.

## Frequently asked questions about NDCalc2

### What is NDCalc2 used for?

NDCalc2 helps photographers calculate the correct exposure time when using Neutral Density (ND) filters. It takes the known exposure time without a filter and the ND filter's value to determine the adjusted exposure time.

### Does NDCalc2 support custom filters?

Yes, NDCalc2 allows you to add your own filters that are not in the default list. You can add them by f-stops, ND-Value, or Factor, making the app more personalized to your gear.

### Can NDCalc2 be used for filter stacking?

Absolutely. NDCalc2 features a Multi-Select Mode that allows you to easily manage and select multiple stacked filters for long exposure photography.

### What devices does NDCalc2 support?

NDCalc2 is designed for iOS devices, specifically supporting the 4-inch screens of iPhone 5/s/c and iPod Touch. It also supports Retina displays.

### How does NDCalc2 handle very long exposures?

For exposure times of 4 seconds or longer, NDCalc2 provides a countdown button. This feature aids in manually stopping longer exposures, often used with a remote shutter release, and includes alarm and vibration support.

### What is the price of NDCalc2?

NDCalc2 is a paid application, available for $0.99. This one-time purchase grants you access to all its features.

### How often is NDCalc2 updated?

The latest version of NDCalc2 is 2.2, last updated on October 5, 2015. While updates have not been frequent recently, the app was built for iOS 7 and supports modern iPhone screen sizes.

### What is the user sentiment for NDCalc2?

Based on the available data, NDCalc2 has a rating of 1.5 stars from 2 ratings. This suggests a mixed to negative user reception, potentially indicating areas for improvement in user experience or functionality.

## Version history (last 3 releases)

### 2.2 — 2015-10-05

This update from Apple will improve the functionality of this app. No new features are included.

Ready for 4,7" and 5,5" Screens in your iPhone6(s) and iPhone6(s) Plus

### 2.1 — 2015-09-27

- This Version should run on 64bit-Devices with iOS9 again
- fixed a bug when entering a high value in the ND-Field (now it's limited to ND9 which is a factor of 1.000.000.000 - I don't think there's such filter available ;))

### 1.0 — 2014-02-24

No release notes.

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| App | Rating | Price | Category |
| --- | --- | --- | --- |
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| [ND Filters](https://appshunter.io/ios/app/nd-filters/id1449381658) | — | $0.99 | Photo & Video |
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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 2026-08-24.*