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Photographer's Friend

By Martin Bailey Photography K.K.

This app is only available on the App Store for iOS devices.


Photographer's Friend v2.0 is a complete rebuild of the original MBP Podcast Companion App. While rebuilding from the ground up, we concentrated on three main areas in this release.

1. Making the popular Depth of Field Calculator even easier to use.

2. We added a completely new Neutral Density Filter Calculator, capable of applying multiple filters and calculating shutter speeds up to 30 years!

3. The app is now universal, working natively on all sized screen iPad and iPhones, including working perfectly in Split View on the iPad.

Photographer's Friend Main Features

Depth of Field Calculator [DoF Calc]

The depth of field calculator was the most useful feature of the original app and it's now even more intuitive! Just select your camera sensor type (35mm full frame, crop factor, medium and large format) then choose your aperture, focal length and focus distance (the distance to your main subject) and the calculator displays your depth of field including the near limit and far limit, and hyperfocal distance.

If you tap the Hyperfocal Distance label the focus distance dial is automatically set to the hyperfocal distance and all displayed information is updated. From V2.1 you can also tap Hyperfocal Distance again to return to your initially selected focus distance. Tap the [Focus ft/m] button to toggle between feet and meters.

Neutral Density Filter Calculator [ND Calc]

The neutral density filter calculator takes any shutter speed that you might set on your camera and calculates your new shutter speed after applying neutral density filters to your lens. The filters are labeled by the multiplication factor (ND2, ND4 etc.) and also have the f-stop and optical density values for each filter, so there is no confusion as to what to select.

From V2.1 you can now hide filters that you don't use from the list by sliding them to the left. To return filters to the list, just press a button below the shutter speed dial and slide filters again.

A timer is available for shutter speeds of 5 seconds or more, so if you don't have a timer switch or built-in timer in your camera, we'll time your exposure for you! If you get a phone call or need to use another app during a long count-down, just background the app, and it will update when you open it again. If you give us permission to use Notification Center on your device (requested the first time you set a timer) we'll display an alert when the timer finishes, even if you reboot your device during the count-down.

Although it's unlikely that you'll ever need this in real-life, the ND Calculator allows stacking of filters for up to 30-year exposures. This is great for understanding how neutral density filters affect the shutter speed and for teaching others when necessary. When you've finished playing there's a Remove All button to clear the filters and start again.


We've included a scrolling page of links to in-depth articles on Hyperfocal Distance and Understanding Neutral Density Filters, as well as to the popular Martin Bailey Photography Podcast and Blog, which has been released weekly for more than twelve years. There are links to email us directly or use our web contact form to ask generally 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 consider adding it in a future update.


There are two multi-page help sections with detailed information to help you understand both the Depth of Field Calculator and the Neutral Density Calculator. Along with the linked articles, ​you'll fully understand these topics in no time.

Whether you are just getting started or a seasoned professional, we think you'll find these two calculators in one app invaluable.

What's New in Version 2.2

Selected Neutral Density filters are now saved and restored after app or device restart
Added new Help pages with information on hiding/unhiding ND filters and updated other Help screenshots
Changed the Contact Us web link to point to the app Technical Support page contact form
Fixed a bug that caused the Quick Tips to be displayed every time the [Focus ft/m] label is tapped after the first install of the app.


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Photographer's Friend
View in iTunes
This app is designed for both iPhone and iPad
  • $2.99
  • Category: Photo & Video
  • Updated:
  • Version: 2.2
  • Size: 25.4 MB
  • Language: English
  • Seller:

Compatibility: Requires iOS 10.0 or later. Compatible with iPhone, iPad, and iPod touch.

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