# DBW FilmCalc — Bellows, reciprocity & timer

> Bellows, reciprocity & timer (iPhone/iPad app by Ian Barber.)

- Source: https://appshunter.io/ios/app/dbw-filmcalc/id6813898010 (this page in markdown: same URL + `.md`)
- Developer: [Ian Barber](https://appshunter.io/developer/6790919344)
- Category: Photo & Video, Utilities
- Price: Free
- Age rating: 4+
- Requires: iOS 17.0 · 1 MB
- Languages: American English
- Released: 2026-09-25
- Data updated: 2026-10-15

## What is DBW FilmCalc?

DBW FilmCalc is a simple exposure companion for black and white film photographers. Enter what you know and get the exposure you need, then time it from your iPhone.

• Bellows: compensation in stops and exposure factor for your lens and bellows extension
• Reciprocity: manufacturer-published correction for your film
• Exposure: film, metered time and optional bellows, corrected in the right order, with a big result and a START TIMER button
• Timer: large full-screen timer that keeps accurate time and stays awake while running, with a soft chime and haptic at the end
• Light, dark and red night modes, big touch targets, VoiceOver and Dynamic Type

Supported films, each with its data source shown in the app:
• Ilford HP5 Plus, FP4 Plus, Delta 100 Professional, Delta 400 Professional, Pan F Plus
• Kodak Tri-X 400, T-Max 100, T-Max 400
• Kentmere Pan 100, Pan 400
• Fomapan 100 Classic, 200 Creative, 400 Action

No account, no ads, no tracking, no internet needed. The app collects no personal data.

Made by Digital Black & White.

Results follow manufacturers' published data but depend on your film, developer and conditions, so make test exposures for critical work. Film names are trademarks of their respective owners. Not affiliated with or endorsed by them.

## Is DBW FilmCalc safe?

Not enough ratings yet to assess DBW FilmCalc.

## Is DBW FilmCalc legit?

DBW FilmCalc has limited verification signals. The AppsHunter Legitimacy Score for DBW FilmCalc is 58 out of 100 points across 7 verification signals from App Store and developer data.


## Version history (last 4 releases)

### 1.3 — 2026-10-06

Millimetres or inches

Lens focal length and bellows extension can now be entered in mm or inches. Each field has its own switch, so a lens marked in inches works on a rail marked in mm. Your choice is remembered, and switching converts the number you have already typed.

Also new: a short DBW welcome screen when the app opens.

### 1.2 — 2026-09-29

Add your own films
You can now add a custom film from the film picker, for anything not in the verified list, including colour film. Just give it a name and a reciprocity exponent and it works exactly like any of the built-in films, with edit and delete options if you want to refine your own figures later.

### 1.1 — 2026-09-27

A small fix: on Bellows and Exposure, the field you were typing into could sometimes be hidden behind the keyboard. It now scrolls into view as you type.

### 1.0 — 2026-09-25

No release notes.

## Apps similar to DBW FilmCalc

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Silverlog Pinhole](https://appshunter.io/ios/app/silverlog-pinhole/id6759198053) | — | Free | Photo & Video |
| [Silverlog Mix](https://appshunter.io/ios/app/silverlog-mix/id6756785829) | — | Free | Photo & Video |
| [Silverlog](https://appshunter.io/ios/app/silverlog/id6755815649) | — | Free | Photo & Video |
| [Silverlog Scan](https://appshunter.io/ios/app/silverlog-scan/id6759198163) | — | Free | Photo & Video |
| [ProLab Film Developer](https://appshunter.io/ios/app/prolab-film-developer/id6759682425) | 5.0 (3) | $7.99 | Photo & Video |
| [Silverlog Reciprocity](https://appshunter.io/ios/app/silverlog-reciprocity/id6756740671) | — | Free | Photo & Video |

## More apps by Ian Barber

- [Fomapan Reciprocity](https://appshunter.io/ios/app/fomapan-reciprocity/id6790919342)

All apps by Ian Barber: https://appshunter.io/developer/6790919344

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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 2026-10-15.*