# Factor: Precision Light Meter — Light Meter & Exposure Tools

> iPhone light meter, filter, bellows, and reciprocity failure calculator for photographers. (iPhone/iPad app by Haptic Software, LLC.)

- Source: https://appshunter.io/ios/app/factor-precision-light-meter/id1643250194 (this page in markdown: same URL + `.md`)
- Developer: [Haptic Software, LLC](https://appshunter.io/developer/1642230523)
- Category: Photo & Video, Utilities
- Price: $0.99 (on sale, was $1.99)
- Rating: 5.00/5 from 1 App Store ratings
- Age rating: 4+
- Requires: iOS 17.6 · 2 MB
- Languages: English
- Released: 2022-09-13
- Data updated: 2026-06-13
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/factor-precision-light-meter/id1643250194/reviews.md

## What is Factor?

Perfect for film photographers, large format artists, and manual digital shooters who demand precision and reliability in the field.

Precision Light Meter
- Turn your iPhone into a professional reflected light meter with real-time camera readings. Set your ISO and aperture, instantly get perfectly calculated shutter speeds snapped to standard photographic values.

Filter Factor Calculator
- Shooting with ND, color, or contrast filters? Calculate exact exposure compensation based on filter f-stop reduction for consistent results every time.

Bellows Extension Calculator
- Master macro and large format photography with accurate light loss compensation using lens focal length and bellows draw measurements.

Reciprocity Failure Calculator
- Conquer long exposures on film! Manage your personal film stock library with unique reciprocity characteristics and get precisely adjusted exposure times for perfect nightscapes and creative shots.

## Key features

- Professional reflected light meter
- Filter factor calculator
- Bellows extension calculator
- Reciprocity failure calculator
- Custom film stock library


## Frequently asked questions about Factor

### What is Factor?

Factor is a precision light meter app that turns your iPhone into a professional tool for photographers. It offers features like a reflected light meter, filter factor calculator, bellows extension calculator, and reciprocity failure calculator.

### How much does Factor cost?

Factor is a paid app, priced at $0.99. This one-time purchase grants you access to all its features without any subscriptions or in-app purchases.

### What devices does Factor support?

Factor is currently supported on iPhone devices. It is designed to leverage the camera and processing capabilities of iPhones for its light metering functions.

### Is Factor suitable for beginners?

While Factor offers professional-grade tools, its precision features are particularly beneficial for experienced film photographers, large format artists, and manual digital shooters. Beginners might find the advanced calculations require some understanding of photographic principles.

### Does Factor have ads?

No, Factor does not contain advertisements. As a paid application, it provides an ad-free experience for its users.

### How often is Factor updated?

Factor was last updated on June 25, 2025, indicating active development and support. Users can expect ongoing improvements and potential new features.

### What is the age rating for Factor?

Factor has an age rating of 4+, making it suitable for users of all ages. This rating reflects the app's content and functionality.

### Can Factor help with long exposures on film?

Yes, Factor includes a Reciprocity Failure Calculator specifically designed to help with long exposures on film. You can manage a library of your film stocks' unique characteristics to get precisely adjusted exposure times.

## Version history (last 5 releases)

### 3.2.3 — 2025-06-25

Updated app icon set that now supports customization

### 3.2.2 — 2025-06-05

Improvements to the user experience in the light meter view

### 3.2.1 — 2025-06-01

Minor fixes and performance improvements

### 3.2 — 2025-05-23

- Improvements to the light meter engine to make calculations more reliable and reduce loading times
- Visual refinements to the dashboard for clarity and cleanliness
- Bug fixes

### 3.1 — 2025-05-06

- UI Refinements

## Apps similar to Factor

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Film Rolls – App for Film Photographers](https://appshunter.io/ios/app/film-rolls-app-for-film-photographers/id675626559) | 4.1 (29) | Free | Photo & Video |
| [Best Photo Times+](https://appshunter.io/ios/app/best-photo-times-plus/id488441160) | 1.8 (6) | Free | Photo & Video |
| [Reciprocity Plus](https://appshunter.io/ios/app/reciprocity-plus/id898649178) | 4.3 (6) | $1.99 | Photo & Video |
| [Analog - Film Roll Notebook](https://appshunter.io/ios/app/analog-film-roll-notebook/id1265215595) | 4.2 (12) | Free | Photo & Video |
| [FilmHolders](https://appshunter.io/ios/app/filmholders/id1586606596) | 4.6 (5) | Free | Photo & Video |
| [Photo GPS Remover](https://appshunter.io/ios/app/photo-gps-remover/id1082158081) | 4.6 (26) | Free | Photo & Video |

## More apps by Haptic Software, LLC

- [Spindown: MTG Life Counter](https://appshunter.io/ios/app/spindown-mtg-life-counter/id1671844369)
- [Albums- The Music App](https://appshunter.io/ios/app/albums-the-music-app/id6745360976)
- [Solar: Sun Tracker & Forecast](https://appshunter.io/ios/app/solar-sun-tracker-and-forecast/id6745826724)

All apps by Haptic Software, LLC: https://appshunter.io/developer/1642230523

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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 2026-06-13.*