# Perfect Exposure

> Photography calculator for exposure, time-lapse, stars, and depth of field. (iPhone/iPad app by Haoyuan Xia.)

- Source: https://appshunter.io/ios/app/perfect-exposure/id1388698298 (this page in markdown: same URL + `.md`)
- Developer: [Haoyuan Xia](https://appshunter.io/developer/1044926382)
- Category: Photo & Video
- Price: Free
- Rating: 3.30/5 from 7 App Store ratings · 2 written reviews indexed
- Age rating: 4+
- Requires: iOS 10.0 · 17 MB
- Languages: American English
- Released: 2018-10-16
- Data updated: 2026-06-01
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/perfect-exposure/id1388698298/reviews.md

## What is Perfect Exposure?

• Exposure
Perfect Exposure helps you calculate the exposure time when you change the aperture, ISO, or ND filters.

• Time-lapse
Perfect Exposure helps you plan a time-lapse shot by calculating the shooting duration and the final video duration.

• Stars
Perfect Exposure tells you maximum exposure time to produce sharp stars without trails. It includes the widely-used 600 Rule and 500 Rule, as well as the more accurate NPF Rule.

• Star Trails
Perfect Exposure calculates the angular length of the star trails within a certain period. It also shows an illustration of the actual scene.*

• Depth of Field
Perfect Exposure calculates the depth of field under certain focal length and aperture, as well as the hyperfocal distance.


* The illustration does not reflect the actual position of stars in the sky.

## Key features

- Exposure time calculation
- Time-lapse planning
- Sharp star exposure limits
- Star trail calculation
- Depth of field calculation
- Hyperfocal distance

## Recent user reviews (2 of 2)

All indexed reviews: https://appshunter.io/ios/app/perfect-exposure/id1388698298/reviews.md

### 5/5 — Awesome exposure calculator

*2023-02-20*

Super useful for studio photography and or using ND filters. The exposure calculator is an awesome tool that lets you compare one set of exposure settings to another. I wanted to use it for my studio lighting setup where I knew what settings provided a properly exposed shot and I wanted to get an ND filter in order to shoot a wider aperture. This app allowed me to figure out what ND filter was necessary. 

Only improvement is I wish the range of selectable ISO went down to 50 instead of 100 being the lowest. Not worth subtracting a star for this excellent free app.

### 5/5 — Clean and great!

*2019-05-01*

I am so proud of my time-lapse photography after I use this app.

## Frequently asked questions about Perfect Exposure

### What is Perfect Exposure used for?

Perfect Exposure is a photography tool that helps you calculate camera settings. It assists with exposure time, time-lapse planning, star photography limits, star trails, and depth of field.

### Does Perfect Exposure have ads?

No, Perfect Exposure is ad-free. It does not contain any advertisements, allowing for an uninterrupted user experience.

### What devices does Perfect Exposure support?

Perfect Exposure is available on iPhone, iPad, and iPod touch devices, making it accessible to a wide range of Apple users.

### How often is Perfect Exposure updated?

The latest version of Perfect Exposure was released on November 10, 2019. While updates are not frequent, the app provides core functionality for photographers.

### What is the age rating for Perfect Exposure?

Perfect Exposure has an age rating of 4+, making it suitable for users of all ages.

### How does Perfect Exposure help with star photography?

Perfect Exposure calculates the maximum exposure time needed for sharp stars without trails, using rules like the 600 Rule, 500 Rule, and the NPF Rule.

### Can Perfect Exposure help with depth of field calculations?

Yes, Perfect Exposure can calculate the depth of field based on your focal length and aperture. It also provides the hyperfocal distance.

### What is the user rating for Perfect Exposure?

Perfect Exposure has a rating of 3.3 stars based on 7 user ratings. This indicates a mixed but generally positive reception from its user base.

## Version history (last 5 releases)

### 6.0 — 2019-11-10

• Added support for iOS 13
• Minor UI improvements
• Minor bug fixes

### 5.0 — 2019-08-18

• Performance and stability improvements

### 4.0 — 2019-07-14

• Introduced a new module: Depth of Field
• Included two medium format sensor sizes
• Minor UI improvements

### 3.0 — 2019-05-05

• Redesigned UI for better experience
• Added the capability to save values from last use
• Fixed an issue which prevented text boxes from updating after multiple edits before pressing the “Return” key

### 2.0 — 2019-04-21

• Introduced three new modules: Time-lapse, Stars, and Star Trails
• Added a top-level menu for quick navigation
• Adopted a monospaced font for timers to prevent “Shaky” text
• Minor theme color adjustments for a more consistent UI

## Apps similar to Perfect Exposure

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Mango Exposure: The Calculator](https://appshunter.io/ios/app/mango-exposure-the-calculator/id1487020105) | 5.0 (1) | Free | Photo & Video |
| [Focal Length Calculator](https://appshunter.io/ios/app/focal-length-calculator/id6443980209) | — | $2.99 | Photo & Video |
| [Flash Photography Adviser](https://appshunter.io/ios/app/flash-photography-adviser/id1354932744) | 5.0 (2) | $0.99 | Photo & Video |
| [pCAM Pro - Camera Tools](https://appshunter.io/ios/app/pcam-pro-camera-tools/id1308057201) | 4.9 (218) | $29.99 | Photo & Video |
| [Exposure Equivalence](https://appshunter.io/ios/app/exposure-equivalence/id6469605168) | — | $0.99 | Photo & Video |
| [Photo Friend exposure and DoF](https://appshunter.io/ios/app/photo-friend-exposure-and-dof/id1198327295) | 4.1 (9) | Free | Photo & Video |

## More apps by Haoyuan Xia

- [Minesweeper Redesigned](https://appshunter.io/ios/app/minesweeper-redesigned/id1044945344)
- [Peintre](https://appshunter.io/ios/app/peintre/id1054184653)
- [Sudoku Redesigned](https://appshunter.io/ios/app/sudoku-redesigned/id1093303285)
- [Code Scan - Barcode Scanner](https://appshunter.io/ios/app/code-scan-barcode-scanner/id1174516206)
- [Vocab Master](https://appshunter.io/ios/app/vocab-master/id1292430740)

All apps by Haoyuan Xia: https://appshunter.io/developer/1044926382

## Related topics

[haoyuan xia](https://appshunter.io/ios/topics/haoyuan-xia)

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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 2026-06-01.*