We added Japanese fully tested, and 14 other machine-translated languages!

Photographer's Friend has three excellent photography calculators in one application, and now with two of them available for Apple Watch with almost full feature parity! We believe our Depth of Field Calculator with the Pixel Peeper mode turned on is the most accurate and detailed DOF Calculator available!

Depth-of-Field Calculator
Calculate the Depth of Field in your photographs based on your camera's sensor size, aperture, focal length, and focus distance, set with four dials along the base of the DoF Calc.

The display includes your Hyperfocal Distance, which can be temporarily transferred to the Focus Distance dial or locked for continuous updates. Display distances in metric units or feet and inches.

By default, we use traditional Depth of Field calculations, but Pixel Peeper mode calculates Depth of Field using your sensor size and megapixels for higher accuracy. You can also enter a custom Circle of Confusion size if you prefer. There's even a diffraction warning mode!

Diffraction Limit guides adjust the color of the Aperture guide when there is a possibility of Diffraction. You can change the Diffraction Limit guide starting points as part of the Pro Add-on available as an In-App purchase.

Neutral Density Filter Calculator
Enter your base shutter speed into the Neutral Density Filter Calculator to calculate your new shutter speed after fitting ND filters to your lens. Filter labels include the multiplication factor (ND2, ND4, etc.) with f-stop and optical density values also displayed. You can hide filters that you don't use or bring them back again with slide gestures.

A timer is available for shutter speeds of 3 seconds or longer, so if you don't have a timer switch or built-in timer in your camera, we'll time your exposure for you!

Exposure Shift Calculator
When changing your camera's exposure settings, it's not always obvious which settings to change to counter adjustments you make. When you adjust your aperture from f/5.6 to f/11, does your shutter speed need to go up or down? How does it affect your ISO? The Exposure Shift Calculator has the answers!

Enter your current camera settings with the Aperture, Shutter Speed, and ISO dials, and watch Photographer's Friend calculate how changes to one dial affect the others. You can lock any of the three dials to calculate the other free dial automatically, or turn on Exposure Value Lock to have Photographer's Friend calculate all settings for you!

Additional Features as In-App Purchases
Photographer's Friend is fully functional at the marked price. However, several features such as Apple Watch Extensions and some Pro features available as In-App Purchase as they may not be of interest to everyone. There is also a bundle to save on the multiple individual Add-ons.

We've included links to in-depth articles on Hyperfocal Distance, Understanding Neutral Density Filters and Circle of Confusion, the Airy Disk and Diffraction, and Understanding Exposure Value, among other helpful content. We've also provided a link to online tutorial videos to walk you through each calculator and the optional Apple Watch Extensions.

There are links to email us directly or use our web contact form to ask general photography questions or send questions or suggestions for the app. We think we have all bases covered, but for example, if you own a Neutral Density filter that is not listed, let us know, and we'll add it in a future update.

Onboarding Help
Depth of Field, Neutral Density, Exposure Shift Calculators, and some settings screens have onboarding help with interface element highlighting to help you get to know your new Photographer's Friend.

Whether you are just getting started or a seasoned professional photographer or educator, we think you'll find Photographer's Friend invaluable!

What’s New

Version 3.7.3

Version 3.7.3
Fixed two broken Apple Watch Complication icons.
Updated some German translations based on customer feedback.
Version 3.7.2
The Apple Watch Add-on now recalls the last used calculator on launch.
Added space between Apple Watch Depth of Field Calculator labels.
Fixed a problem that caused ND Filter Calculator for Apple Watch to reset shutter speed and selected filter strength after restarting the app.
Improved stability when linking Apple Watch and iPhone ND Filter Timers.
Better handling of the switch from Passive Timer to Active Timer on Apple Watch ND Filter Calculator
Version 3.7.1
Fixed some minor settings page formatting issues
Version 3.7
Added Diffraction Limit Guide Adjusters - you can now fine-tune the start points of the amber and red diffraction warnings (included in Pro Add-on)
Added an infinity value slider to the Depth of Field calculator settings screen (included in Pro Add-on).
Added Japanese as a fully supported language and 14 other languages with Machine translation (Arabic, Chinese (Simplified), Chinese (Traditional), French, German, Hebrew, Hindi, Italian, Korean, Malay, Portuguese, Russian, Spanish, Turkish).
Added contextual onboarding help with element highlighting to walk you through settings and usage — accessed via a Help button on calculators and DoF Calc settings screen.
Removed the Main Menu of Photographer's Friend on Apple Watch and changed navigation. See the updated Apple Watch Extension Help in Photographer's Friend for details.
Added ability to buy and restore In-App Purchases directly from Apple Watch.
Added measurement units toggle switch to Depth of Field calculator settings screen.
Now include the near focus limit in the Hyperfocal DoF readout even if it is more than infinity.
Removed help documents for DoF, ND Filter, and Exposure Shift calculators
You can now swipe left and right on the three calculator screens to navigate directly between them.
A long-press on the ND Filter Calculator's Filter Visibility button will now display a dialog that offers to unhide all hidden filters.
Taken the corners off all user interface elements and updated the look and feel to make Photographer's Friend even prettier.
Restored decimals for Near and Far Focus limits in the DoF Calculator.
Fixed an issue that could prevent the Custom Circle of Confusion value from being saved in the Apple Watch Depth of Field Calculator Settings.

Ratings and Reviews

5.0 out of 5
2 Ratings

2 Ratings


One of the best photo apps!!!!!

Fabulous App. The only app I have found that allows me to calculate depth of field when working in the realm of macro. Thanks Martin.

App Privacy

The developer, Martin Bailey Photography K.K., indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy.

Data Not Linked to You

The following data may be collected but it is not linked to your identity:

  • Diagnostics

Privacy practices may vary, for example, based on the features you use or your age. Learn More


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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