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

3.9 out of 5
7 Ratings

7 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.

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!


Oak Studios, LLC
10.4 MB

Requires iOS 12.1 or later. Compatible with iPhone, iPad, and iPod touch.



Age Rating


  • Family Sharing

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

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