f/ Tools: Photo Calculator3.0 - App Store

f/Tools is a toolkit for digital and film photography.

Explore depth of field, compare defocus across lenses, and try different shutter speeds before you shoot. Plan your prints and calculate flash exposure, with interactive diagrams that make photographic concepts easier to understand.

Features:

. Depth of field and hyperfocal distance
See near and far focus limits and how they change with aperture, focal length, and focus distance.

. Defocus comparison
Explore how focal length, aperture, and subject distance affect blur, with a magnifier for a closer look.

. Freeze motion
Calculate the shutter speed needed to limit motion blur based on subject speed, distance, and focal length.

. Motion blur
Try different shutter speeds and visualize the resulting motion trail.

. Diffraction and resolution
Explore Airy disc size and estimated effective resolution as you change the aperture.

. Framing and prints
Calculate scene dimensions, adjust cropping, and find the circle of confusion and minimum resolution needed for your print size and viewing distance.

. Flash exposure
Calculate exposure at different distances using guide number, flash power, aperture, and ISO.

. Your cameras and lenses
Save your equipment and set lens limits for aperture, focal length, and focus distance. Get started quickly with built-in camera presets.

Built-in help explains the controls, calculations, and photographic terms within each tool.

Version History NEW
• Motion Blur tool: explore how shutter speed affects motion trails.
• Dark Mode.
IMPROVED
• Redesigned Defocus tool to compare subjects at different distances.
• Redesigned Flash tool with clearer exposure information at different distances.
• Clearer depth-of-field display.
• Improvements to the Freeze Motion tool.
• Automatic scaling for distance diagrams, without needing to pinch to zoom.
• Interface adapted for iPhone Duo and iPad.
• Interface refinements for easier use.
• Clearer in-app help.
FIXED
• Cropped film formats now work correctly in print mode without changing the print size.
• Editable values can now be edited with a single tap.
• Layout issues on some screen sizes. 3.0 6h ago • Added automatic distance scaling.
• Depth of field with estimated blur and diffraction warnings.
• Airy disc calculator now supports film.
• Improved readability and settings layout. 2.7.7 Oct 3 Bug fixes 2.7.6 Sep 26 Improvements to the flash exposure calculator. 2.7.5 Sep 25 Compatibility improvements with older iOS versions
Interface improvements
Bug fixes 2.7.4 Sep 19 Fixes an issue with iOS 27 2.7.3 Sep 15 Updated for iOS 27.
Minor improvements. 2.7.2 Sep 15 Sync cameras and lenses with iCloud.
Improved integration with myLightmeter PRO. 2.7.1 Sep 2 • Added optional IR distance display at 720 and 850 nm in the depth-of-field calculator, including corrected subject and hyperfocal distances.
• Improved interface scaling on smaller iPhone screens. 2.7 Aug 30 Added support for multiple languages
Bug fixes 2.6.2 Aug 13 Improvements to the format calculator
Bug fixes 2.6.1 Aug 5 Added button to open my Lightmeter PRO
New icon 2.6 Aug 5 Improvements and bug fixes 2.5.2 Jul 8 Bug fixes and minor improvements 2.5.1 Jun 25 Added an option for half-stop aperture increments. 2.5 Jun 6 - Added long-press numeric input for lens, format, and motion controls.
- Sliders are now slower and more precise.
- Speed is shown in km/h or mph based on preferences.
- Bug fixes and improvements in flash calculator. 2.4 May 1 Bug fixes 2.3.1 Mar 27 bug fixes and UI improvements 2.3 Mar 27 Resolves certain display issues 2.2.10 10/01/2025 Better DOF reading
Added more Leica Camera models 2.2.9 12/14/2024 Updated sensor preset list 2.2.8 11/22/2021 Bug fixes 2.2.6 11/10/2021 Name lenses as you please.
Fixed a crash when a corrupted database is found. 2.2.5 09/20/2021 Update for flash exposure calculator:
Better user experience selecting values
Tap on GN or ISO to input the values from the keyboard. 2.2.4 05/25/2021 Updated graphics to make it more readable in the sun. 2.2.3 05/10/2021