Pinhole Master is a light meter and exposure timer for pinhole photographers, or anybody else photographing with long exposures. Use your iPhone/iPad camera to determine the light level (Exposure Value). Tap on the preview display to localise a reading then fine tune the result with the slider. Alternatively insert a Lumu device for incident light measurement or enter an EV measurement manually.

Maintain a library of cameras you own and films/papers you use, together with optional fully customisable reciprocity failure compensation. Tap to Hold a light reading for when you're ready to make the exposure, if desired. Then tap on Start Timer at the same time as you begin your exposure. A record of all settings used along with the preview image is automatically written to a Log for future reference.

Features include:

Supports apertures from f/1 to f/999, Exposure Index (ISO) from 1 to 9999, (optional) filters up to 10 stops

Fast and accurate EV readings displayed to one decimal place or thirds (computed as 64-bit internally)

Calibrate your device camera sensitivity in Settings with minimum and maximum EV levels to avoid bogus readings, especially in low light

Preview overlays of the EV level and camera/film parameters (which can be turned off in Settings)

Film/paper-specific reciprocity failure compensation from your own testing, manufacturer specifications or measurements you've found on the web

Sophisticated smoothed interpolation used in determining the compensated exposure time

Coordinates of your capture written to the log, along with a map of the location

Judicious use of GPS to conserve battery life

A modern user interface designed for efficient use in the field

Support for the original Lumu (now Lumu Lite, see for precise incident light measurement

Pinhole Master can help you easily master pinhole photography!

What’s New

Version 2.0

- iOS 13 support (including Dark Mode)
- Filter factors now up to 1024 (10 stops)
- Added selection option in Settings for devices with more than one camera
- Added Reset Calibration option to Meter Range in Settings

Ratings and Reviews

2.0 out of 5
2 Ratings

2 Ratings

App Privacy

The developer, Bitware Australia Pty Ltd, 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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