f-Stop Printing Calculator

The f-Stop Printing Calculator lets darkroom users print in stop increments.

Digitaltruth Photo Ltd · com.digitaltruth.fstop

5.0 out of 5 (1 rating) 5K+ downloads v3.0 2.4 MB Android 4.4+ PEGI 3 · Everyone

Download APK 2.4 MB All versions

Signature matches the Google Play version Details

At a glance

Latest version: v3.0 (4)
Updated: Sep 25, 2026 (13 days ago)
APK size: 2.4 MB
Requires: Android 4.4+ (API 19)
CPU support: Any (no native code)
Category: Photography (app)
Listed since: Apr 20, 2021 (at least)
Permissions: 1
Website: digitaltruth.com
Developer contact: [email protected]

About this APK

f-Stop Printing Calculator is an app by Digitaltruth Photo Ltd in the Photography category, listed since at least April 2021. It has no native code, so it runs on any Android processor.

Since version 2.0, the APK grew from 704.6 KB to 2.4 MB and the minimum Android version rose from 4.1 to 4.4. It asks for 1 permission, none of them sensitive.

What's new in v3.0

Improve Android compatibility.

Description

From the listing uploaded by “appupdater”.

Brought to you by Digitaltruth Photo, The f-Stop Printing Calculator allows darkroom printers to modify times by stops when calculating exposure values. The calculator will establish 1/4 stop increments (+ or – up to 3/4) of the base time you have entered and, either generate a new time, or an increment of an f-stop if you are burning in. By working with f-stops rather than linear units of time, you can produce an easier to read test strip as the exposure differences are exactly equal. This app has been designed by Digitaltruth Photo Ltd and Bruce Tanner.

Version history

2 versions are listed, going back to v2.0. Since v3.0 it requires Android 4.4+.

v3.0 LATEST Sep 25, 2026 2.4 MB TRUSTED v2.0 Jun 4, 2024 704.6 KB TRUSTED

All 2 versions

Security & authenticity

Security rating: Trusted

Signing certificate

Signature matches the Google Play version Checked by the source store on Sep 25, 2026.
Certificate issued to “Digitaltruth Photo Ltd” This is the certificate of the Google Play version.
Same certificate as the other version checked

Store checks and file details

Developer signature verified Sep 25, 2026
Validated against Google Play Sep 25, 2026
Signed byCN=Jon Mided, O=Digitaltruth Photo Ltd
Signing certificate (SHA-1)76:85:D0:CA:79:86:70:30:4A:23:D5:A2:00:F7:E2:3C:9C:A6:78:C9
File MD5ec3ad57020c944f4b0b264e323d5fe2b
Uploaded by “appupdater” Gold tier · 117,810 followers · uploading since 2020

Scans and ratings come from the source store; the certificate comparisons are AAPKs's own, made from the files' published signatures (1 other version compared). AAPKs doesn't scan files itself — compare the MD5 and signer after downloading.

Permissions (1)

f-Stop Printing Calculator requests 1 permission, none of them sensitive.

Internal broadcast protection (app-defined) com.digitaltruth.fstop.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION

Required hardware & features

Basic touch input android.hardware.faketouch

f-Stop Printing Calculator APK: questions and answers

Is there a version of f-Stop Printing Calculator for older Android phones?

The current version needs Android 4.4 or later. Version 2.0 is the newest listed build that installs on Android 4.1 and later. It is an old build: apps that rely on online services may no longer connect when they are this old. Get version 2.0 · All versions

Can I install this APK over the version I already have?

Yes, if your installed copy is older. It is signed like the Google Play version, so Android installs it as an update and keeps your data.

Is the f-Stop Printing Calculator APK safe?

No one can promise that a file is safe, but some things can be checked. The source store rates this file Trusted. Its signature matches the Google Play version. It is signed with the same certificate as the other version checked. After downloading, check that the file's MD5 is ec3ad57020c944f4b0b264e323d5fe2b.