Take the guesswork out of calculating your pinhole camera’s exposure time by using your phone as a light meter.

The meter is designed to work with a pinhole camera with an aperture of f/228 and film paper with an ISO of 10 — a direct match for Kelli Anderson’s ‘This Book is a Camera.’

Includes a timer to count down every second to your ideal exposure, and an inverter to reveal the final image of your pinhole negative.

What’s New

Version 1.0.3

Reduced app size

Ratings and Reviews

4.0 out of 5
10 Ratings

10 Ratings

wompedy ,

Just what I needed!

I love my Camera Book but light metering has until now been a pain point. None of the other light meter apps available were made with pinhole photography in mind. They are also mostly ugly, harder to use AND cost money.

Enter This App is a Light Meter! It solves ALL of the aforementioned problems. Not only does it work perfectly, it is super easy to use, and even has a most helpful bonus feature: An inverter. Now in one FREE app I can get the right exposure time instantly without having to fiddle with settings, set a timer, and even invert my negative after development. So great! Thanks for making this.

visualsofjc ,

Great, but...

This is the best app for calculating exposure times for a pinhole camera. However, it needs a feature where we can change our ISO and f-stop. A lot of people use Ilford RC paper which is around ISO 5. Sometimes our pinholes will be bigger or smaller as well as our focal length. Being able to change these variables would be fantastic.

LittleHappyBro ,

Works really well, easy to understand!

This is a really well-made app, and is very self-explanatory. I went to the class to make one of these cameras, and it works!

App Privacy

The developer, Oak Studios, LLC, has not provided details about its privacy practices and handling of data to Apple. For more information, see the developer’s privacy policy.

No Details Provided

The developer will be required to provide privacy details when they submit their next app update.


  • Family Sharing

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

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