# f-Stop Printing Calculator > Darkroom printing exposure calculator for f-stop adjustments. (iPhone/iPad app by Freestyle Photo & Imaging.) - Source: https://appshunter.io/ios/app/f-stop-printing-calculator/id858392735 (this page in markdown: same URL + `.md`) - Developer: [Freestyle Photo & Imaging](https://appshunter.io/developer/1786429988) - Category: Photo & Video, Utilities - Price: Free - Rating: 3.80/5 from 5 App Store ratings · 5 written reviews indexed - Age rating: 4+ - Requires: iOS 9.0 · 1 MB - Languages: American English - Released: 2014-04-10 - Data updated: 2026-08-14 - Monetization: free - User reviews in markdown: https://appshunter.io/ios/app/f-stop-printing-calculator/id858392735/reviews.md ## What is f? 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. ## Key features - Calculate exposure by f-stop increments - Modify exposure times for printing - Generate new exposure times - Calculate f-stop increments for burning in - Easier test strip creation ## Recent user reviews (5 of 5) All indexed reviews: https://appshunter.io/ios/app/f-stop-printing-calculator/id858392735/reviews.md ### 4/5 — Darkroom Test Print *2026-07-25* It would be helpful if the app calculated the incremental times needed for test strip, starting with base time at -3/4th stop. ### 4/5 — A great start *2024-01-07* This is an easy to use app and a great tool, unfortunately you can only get calculations for +/- 3/4 of a stop. This would be a 5 start app if it could calculate in variations of 1/4 or 1/2 stops up to 2 or 3 stops of adjustment. ### 3/5 — Works well enough *2020-07-14* It would definitely get 5 stars if it went up to multiple stops instead of just 3/4. I lith print and sometimes I need to add up to 4-5 stops of exposure and it would be much simpler to use this instead of figuring it out in my head and calculator. ### 3/5 — Works well for darkroom printing *2015-03-03* Some suggestions for 5 stars would be to display a full stop to 2-3 stops higher as well in the same increments. It would be much more helpful then, rather than having to adjust the time manually to see higher stops. Otherwise though great app! ### 5/5 — Must have for all darkroom fanatics! *2014-04-14* What a genius app, at last a clever & effective tool that saves time & consistency with your prints. Def 5 stars! ## Frequently asked questions about f ### What is f-Stop Printing Calculator used for? f-Stop Printing Calculator is designed for darkroom printers to precisely adjust exposure times by f-stop increments. It helps in calculating exposure values for printing, making test strip creation more straightforward. ### How does f-Stop Printing Calculator calculate exposure? The calculator establishes 1/4 stop increments, up to 3/4, of a base time you enter. It can then generate a new time or an increment for burning-in, ensuring equal exposure differences. ### Is f-Stop Printing Calculator free to use? Yes, f-Stop Printing Calculator is available for free. There are no in-app purchases or advertisements associated with its use. ### What devices support f-Stop Printing Calculator? f-Stop Printing Calculator supports iPhone, iPad, and iPod devices. It is designed for iOS users. ### When was f-Stop Printing Calculator last updated? The latest version of f-Stop Printing Calculator was released on January 30, 2019. The app was originally released on April 10, 2014. ### What is the age rating for f-Stop Printing Calculator? f-Stop Printing Calculator has an age rating of 4+. This indicates it is suitable for a wide range of users. ### Does f-Stop Printing Calculator have ads? No, f-Stop Printing Calculator is ad-free. Users can utilize its features without encountering any advertisements. ### What is the user rating for f-Stop Printing Calculator? f-Stop Printing Calculator has an average rating of 3.8 stars based on 4 user ratings. ## Version history (last 3 releases) ### 2.0 — 2019-01-30 Improved display and compatibility ### 1.1 — 2014-10-17 iOS8 and iPhone 6/6+ compatibility ### 1.0 — 2014-04-09 No release notes. ## Apps similar to f | App | Rating | Price | Category | | --- | --- | --- | --- | | [Crown & Flint](https://appshunter.io/ios/app/crown-and-flint/id6459054973) | 4.7 (15) | Free | Photo & Video | | [Reciprocity Timer](https://appshunter.io/ios/app/reciprocity-timer/id459691262) | 3.0 (3) | $1.99 | Photo & Video | | [ProFilm Meter](https://appshunter.io/ios/app/profilm-meter/id6761498714) | — | $14.99 | Photo & Video | | [LFTools](https://appshunter.io/ios/app/lftools/id6479173686) | — | Free | Photo & Video | | [Chronodev - Darkroom Timer](https://appshunter.io/ios/app/chronodev-darkroom-timer/id6478027671) | 4.5 (2) | Free | Photo & Video | | [Film Photography Viewfinder](https://appshunter.io/ios/app/film-photography-viewfinder/id6741761447) | 5.0 (10) | Free | Photo & Video | ## More apps by Freestyle Photo & Imaging - [Massive Dev Chart Timer](https://appshunter.io/ios/app/massive-dev-chart-timer/id402405770) - [Darkroom Formulas](https://appshunter.io/ios/app/darkroom-formulas/id807461207) - [Darkroom Lab Timer](https://appshunter.io/ios/app/darkroom-lab-timer/id1020149692) - [Phase Timer Pro](https://appshunter.io/ios/app/phase-timer-pro/id6443657713) All apps by Freestyle Photo & Imaging: https://appshunter.io/developer/1786429988 --- *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 2026-08-14.*