DoF Calc
ND Calc
Photographer's Friend
Version 2 had two
great photography
calculators in
one app!
DoF Calc
ND Calc
three!
there were
Then...
dial ranges!
customizable
Calculator with
Exposure Shift
Introducing the
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Photographer's
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3.0
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Photographer’s Friend 3.0

An Assistant in Your Pocket!

We are proud to announce the immediate availability of Photographer’s Friend version 3.0 for iOS!

Photographer’s Friend is the only app in the App Store that contains a Depth of Field Calculator and a Neutral Density Filter Calculator, and now includes the awesome Exposure Shift Calculator!

Now with Three Great Calculators!

Other enhancements in this release include remembering the last tab you were using rather than returning to the Depth of Field calculator after a restart, and we’ve improved the overall look of the three calculators and removed half stops from apertures in DoF Calc and Shutter Speeds in ND Calc. We now use third stops consistently throughout the app.

Product Details

Exposure Shift Calculator

When changing exposure on your camera, 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, and by how much? How does it affect your ISO?

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 just the other free dial automatically, or turn on Exposure Value Lock to have Photographer’s Friend calculator all settings for you!

Exposure Shift Calculator with Aperture Lock engaged
Exposure Shift Calculator Settings
Exposure Shift Calculator Settings

To store your initial settings as a reference, slide the blue central band to the left. To update the settings, slide left again, or slide right to close the blue band.

The Exposure Value display and lock is invaluable when looking for appropriate settings from a light meter EV readout. We’ve also added a button to send your aperture to the Depth of Field Calculator and another to forward your shutter speed to the Neutral Density Filter Calculator.

We’ve included a huge range of apertures and ISOs that are not available on many cameras. These are great for educational purposes, but in practical use you will probably not need them, so we’ve included a settings screen that appears when you tap the cogwheel in the bottom left corner of the Exposure Calculator, and in the settings you can set the top and bottom limits of each of the three dials to bring the ranges in line with your camera or your own acceptable setting ranges.

Depth of Field Calculator

The Depth of Field Calculator [DoF Calc] is intuitive and easy to use, but provides a level of detail to satisfy even the most discerning photographer! Just select your camera sensor type (35mm full frame, 1.3X 1.5X or 1.6X crop factor, 1-inch, micro 4/3, or one of the medium or large format sizes) then choose your aperture, focal length and focus distance (the approximate distance to your main subject).

DoF Calculator
DoF Calculator

The calculator then instantly displays your depth of field including the near limit, 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. Tap again and your initially selected focus distance is restored.

Tap the [Focus ft/m] button to toggle between feet and meters. To make this interaction easy to remember, the labels that have a function are blue.

Pixel Peeper Mode

Traditionally Depth of Field is calculated assuming sharpness determined in an 8 x 10-inch print viewed at arm’s length, but this can lead to slightly soft images when evaluated at 100% on a computer screen. Enter Pixel Peeper mode! The first difference is that the calculated depth of field is somewhat shallower in Pixel Peeper mode, to ensure that your image is sharp when inspected while zoomed in on a computer. This means that you would have to use a smaller aperture to gain adequate Depth of Field.

When enabled we calculate and display your Pixel Pitch, Airy Disk, and Circle of Confusion size, and calculate Depth of Field, all from your selected sensor size and megapixels.

DoF Calc Details Display and Settings Buttons
DoF Calc Details Display and Settings Buttons

There is also an option to display diffraction warning color coding for the Airy Disk display and Aperture dial. Green means no problems, amber indicates there’s a risk of seeing effects of diffraction, and red lets you know when your image is most likely diffraction limited.

Diffraction Warning Color Coding
Diffraction Warning Color Coding

Note that whether or not you actually see the effects of Diffraction in your photograph depends on your camera and lens, and your own perception of sharpness. The Diffraction Warnings are intended as a guide, to show you when the risk is there, but there is no guarantee that you will actually see anything in your image. In our tests with a Canon EOS 5Ds R lens, we found that Diffraction doesn’t become noticeable in photographs until f/22. We strongly urge you to test your own lenses, and if necessary, you can calibrate the warnings by using a different megapixel count or Custom CoC so that the red warning kicks-in in line with your findings. Information on how we tested for Diffraction can be found in this post.

Custom Circle of Confusion

You can also enter a custom Circle of Confusion size as a basis for Depth of Field calculation if you prefer.

DoF Calculator NightView

Should you need to use the Depth of Field Calculator at night, the mainly white screen would appear bright, even with your display brightness turned right down, so we’ve built in a NightView mode. Just shake your device while in the DoF Calc tab to enter NightView, which is mainly black and red, so it won’t mess up your night vision. Note that the other tabs remain white, so stay in the DoF Calc for NightView, and just shake your device again to go back to the normal view.

DoF Calculator Night View
DoF Calculator Night View

Intensely Detailed

We didn’t have to go this far but thought it was fun to provide apertures down to f/0.7 because there are actual lenses that go that wide, although very rare. You can also increase focal length and/or decrease focus distance to the point that your depth of field is as shallow as 0.1mm, and then we switch to µm (micrometers or micron) and continue to calculate down to single digit µm. That’s 0.0001 cm. Talk about razor thin depth of field! Crazy, but fun to play with, and you never know, you might need this one day.

DoF Calculator Detailed Information
DoF Calculator Detailed Information

Quick Tips

When you first install Photographer’s Friend, a Quick Tips tutorial will display multiple passages of textual help over the four dials in the DoF Calculator and Exposure Shift Calculator to get you started. To view these tips again, just tap the Quick Taps button on each respective screen.

ND Calculator Timer Ready
ND Calculator Timer Ready

Neutral Density Filter Calculator

The neutral density filter calculator takes any shutter speed that you can 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 which filters to select. 

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.

When you first set a timer, we’ll ask for permission for Photographer’s Friend to use Notification Center on your iOS device. We only use this for the timer, but when enabled, we’ll display an alert when the timer finishes, even if you close the app or 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. As you add filters after you reached 30 years, they will be automatically removed, and if you increase the base shutter speed taking you past 30 years, we’ll remove the largest filter and display a message to let you know what we removed. When you’ve finished there’s a Reset button to clear the filters and start again.

Hide/Unhide Filters

To hide filters that you don’t use just slide them to the left. Once filters are hidden, the button below the Shutter Speed dial displays how many filters are hidden. Tap this button to display the hidden filters with a dark background, and slide them to left again to unhide them if necessary. When you finish unhiding filters, click the red button to exit unhide mode before continuing to use the ND calculator.

ND Calculator Hiding Filters
ND Calculator Hiding Filters
ND Calculator Unhiding Filters
ND Calculator Unhiding Filters

Split View

Photographer’s Friend runs great on iPhones and iPads of all sizes. It also supports split view on iPads that support it, so you can shrink the app down to various sizes and view other apps at the same time!

ES Calculator in Split  View
ES Calculator in Split View

Links Tab

On the Links tab, we’ve included a scrolling list linking to in-depth articles on Hyperfocal Distance, Understanding Neutral Density Filters, Understanding Exposure Value, and Circle of Confusion, as well as links to our 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 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 consider adding them in a future update.

Help Pages

There are two multi-page help sections with detailed information to help you understand the Depth of Field calculator, the Neutral Density calculator, and the Exposure Shift Calculator. Just swipe through the pages and tap Done to return to the Help tab. Along with the linked articles, you’ll fully understand these topics in no time.

Video Tutorials

We are currently working on a video tutorial for each calculator and will share these here once available. There is also a new link to this page on the Links tab in Photographer’s Friend.

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

Photographer's Friend on App Store
Photographer’s Friend on App Store

Buy the App!

Pick up your copy of Photographer’s Friend from the App Store today!

Note that it is no longer possible to buy iOS apps on a PC. Please click through to the App Store on an iOS device and opt to open the link in the App Store app to buy Photographer’s Friend.

Alternatively, if you have a QR code scanner on your device, you can scan this code!

Rate and Review

Once you’ve given Photographer’s Friend a try, we’d really appreciate it if you could rate the app and leave us a review on the App Store. This really helps us to get ranked higher and make more sales!

Technical Support

Visit the Photographer’s Friend Technical Support page for information on updates, known issues and to contact us for help should you require it.

Apple, the Apple logo, iPhone, and iPad are trademarks of Apple Inc., registered in the U.S. and other countries and regions. App Store is a service mark of Apple Inc.

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