# Slower Shutter Exposure Calc — Long Exposure Calculator

> Long exposure calculator for photographers using ND filters. (iPhone/iPad app by Michael Wong.)

- Source: https://appshunter.io/ios/app/slower-shutter-exposure-calc/id894933600 (this page in markdown: same URL + `.md`)
- Developer: [Michael Wong](https://appshunter.io/developer/894933603)
- Category: Photo & Video, Productivity
- Price: $2.99
- Rating: 3.80/5 from 5 App Store ratings · 7 written reviews indexed
- Age rating: 4+
- Requires: iOS 11.3 · 1 MB
- Languages: English
- Released: 2014-07-13
- Data updated: 2026-06-10
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/slower-shutter-exposure-calc/id894933600/reviews.md

## What is Slower Shutter Exposure Calc?

FEATURED TWO TIMES IN ITUNES PHOTOGRAPHY FOR PROFESSIONALS COLLECTIONS.

PLEASE NOTE: THIS APP IS NOT A CAMERA APP. THIS APP DOES NOT CONTROL YOUR PHONE'S CAMERA.

Slower Shutter is the long exposure calculator that is a must-have for any landscape photographer who is shooting with ND filters to slow down the movement in their photo.

Simply enter the shutter speed for an exposure without a ND filter and then select the strength of your ND filter. Slower Shutter will then calculate the correct shutter speed for the correct long exposure time for up to 16 stops of ND.

REVIEWS:
"Slower Shutter is my favorite app to figure out the shutter speed for my long exposure photos.”
MATT KLOSKOWSKI

"If you are into landscape photography or long exposures at all… THIS IS THE APP FOR YOU!"
SAL CINCOTTA

"Slower Shutter is an awesome new iOS app from my friend Mike Wong. He set out to create the simplest and most awesome long exposure photography calculator...I think he was successful."
SCOTT WYDEN KIVOWITZ

"I could have made a few educated guesses about the right exposure time using the ND filter, but it was really helpful to have the Slower Shutter app to do that bit of thinking for me."
ROB SYLVAN

FEATURES:
- Built-in Timer. Includes a countdown timer to help you know how long your shutter should be open.
- Supports up to 16 stops of ND so you can stack your ND filters
- Countdown timer works in the background & alerts you when there are 10 seconds remaining
- Animated circular progress bar
- Supports iOS 9 and the new system font, San Francisco
- No advertisements
- Optimized for iPhone 5, 5s, 6, 6 Plus, 6s, 6s Plus

INSTRUCTIONS:
For instructions on how to use Slower Shutter to calculate a long exposure time, please visit my site at http://untitledapps.com/use-slower-shutter/

From within the app, you can tap the i button to get instructions if necessary.

SUPPORT:
This app has been built by a photographer for photographers. Feel free to contact me if you find a bug or have a suggestion. I value your feedback.

Your DSLR or Mirrorless camera can cover the shutter speeds up to and including 30 seconds. After that, set your camera to Bulb mode & connect your manual cable release. Use the included timer in Slower Shutter to know how long to leave your shutter open.

## Key features

- ND filter strength input
- Calculates long exposure shutter speed
- Supports up to 16 stops of ND
- Built-in countdown timer
- Background timer alerts
- Animated progress bar

## Recent user reviews (7 of 7)

All indexed reviews: https://appshunter.io/ios/app/slower-shutter-exposure-calc/id894933600/reviews.md

### 5/5 — Been using it for years. Just a minor change in the UI would be great.

*2019-03-25, version 1.5.1*

I've been happy with how straightforward this app is. If there's only one change I would do, it would be the placement of the info button. Currently, it is below the Set Timer and there are times that I've hit it by accident and it brings up that little tutorial menu. When you click Done to go back to the calculator, everything resets. Perhaps place it on one of the upper corners? Or anywhere else that your fingers wouldn't normally hover unless you intend to.

### 5/5 — Great app.

*2019-03-19, version 1.5.1*

I am revising previous review. Phone issue was causing this app not to work. Works fine now. Used the app and thing worked fine. Nd photos were great! Thanks!

**Developer response:** Hello. If you’re willing to provide some details, I’ll be happy to help.

### 5/5 — Nice app

*2015-08-01, version 1.2*

Great app. I'm using this app all the time with my canon 5d for slow shutter photos.

### 5/5 — Great App - People need to learn to read

*2015-07-28, version 1.2*

This App is perfect. Does exactly what it is supposed to do - be a calculator for exposure times. Simple. Don't listen to the bad reviews from people that don't know how to read or use their camera. Wow. I cannot believe how stupid some are.

### 5/5 — Slow Shutter is a Great App

*2015-04-04, version 1.2*

I don't understand why some reviewers are complaining. This App plainly states exactly what it is for AND what it will and will not do, in the description. I use it for what its made for and it is pretty much spot on, with the information I need to shoot long exposure photography. I rate it a solid 5.

### 2/5 — Bit misleading

*2014-12-08, version 1.2*

As with a previous review, I thought this was a shutter speed app for the iPhone. It's not, it's for use in conjunction with a DLSR and ND filters. Glad it was only 99¢ but that was 99¢ I could have spent on a dollar menu somewhere.

### 2/5 — Not what I thought it was

*2014-11-17, version 1.2*

When I first heard about this, I thought it allowed you to take slow-shutter shots with your iPhone, but it appears to be an exposure calculator with a timer that I don’t understand how to use along-side a DSLR camera. Don’t buy this if you think you’re going to take a picture with it.

## Frequently asked questions about Slower Shutter Exposure Calc

### What is Slower Shutter Exposure Calc used for?

Slower Shutter Exposure Calc is used to calculate the correct shutter speed for long exposure photography when using ND filters. It helps photographers determine the precise exposure time needed to achieve desired motion blur effects.

### Does Slower Shutter Exposure Calc control my camera?

No, Slower Shutter Exposure Calc is not a camera app and does not control your phone's camera. It functions solely as a calculator to help you set your camera's shutter speed manually.

### How many stops of ND filtration does Slower Shutter Exposure Calc support?

Slower Shutter Exposure Calc supports up to 16 stops of ND filtration. This allows for calculations when using multiple ND filters stacked together.

### Does Slower Shutter Exposure Calc have a timer?

Yes, Slower Shutter Exposure Calc includes a built-in countdown timer that can run in the background and alert you when 10 seconds remain in your exposure.

### What is the price of Slower Shutter Exposure Calc?

Slower Shutter Exposure Calc is a paid app priced at $2.99. There are no in-app purchases or subscription fees associated with its use.

### What devices is Slower Shutter Exposure Calc compatible with?

Slower Shutter Exposure Calc is optimized for iPhone and compatible with iPads and iPods. It supports iOS 9 and uses the San Francisco system font.

### How often is Slower Shutter Exposure Calc updated?

The latest version of Slower Shutter Exposure Calc is 1.5.1, last updated on June 8, 2018. While updates have not been frequent recently, the app is stable for its intended purpose.

### Does Slower Shutter Exposure Calc have ads?

No, Slower Shutter Exposure Calc is advertised as having no advertisements. Users can enjoy an ad-free experience while calculating their long exposures.

## Version history (last 1 release)

### 1.5.1 — 2018-06-08

This app has been updated by Apple to display the Apple Watch app icon.

Added support for the iPhone X and improved support for iOS 11. Users of iPhone SE, iPhone 6/6s, iPhone 7/7 Plus and iPhone 8/8 Plus may see slight user interface improvements now that Slower Shutter is fully utilizing the iOS Auto Layout functionality.

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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 2026-06-10.*