ZoneCalc – Zone System Meter
Film Exposure Calculator
About
This app assists photographers in precisely calculating exposure and tonal placement using Ansel Adams' Zone System. It offers features for metering, reciprocity correction, and development adjustments, with options for multi-point measurements and data export.
What's New in ZoneCalc
1.2
August 3, 2026
You can now enter custom aperture values for pinhole work. The aperture picker has a free-entry field, so f-numbers beyond f/32, such as f/138, feed straight into the Zone System calculation.
MoreIn-App Purchases
$3.99
ZoneCalc Pro
Unlocks all Pro features permanently
FAQ
What is ZoneCalc used for?
ZoneCalc is a precision tool for photographers following Ansel Adams' Zone System. It helps calculate exposure and tonal placement for film photography, offering features like metering, reciprocity correction, and development adjustments.
Does ZoneCalc have ads?
No, ZoneCalc does not contain advertisements. The app is designed to be ad-free for an uninterrupted user experience.
What is the price of ZoneCalc?
ZoneCalc is free to download and use. A one-time Pro upgrade is available to unlock additional features, but there are no subscriptions.
What are the Pro features in ZoneCalc?
The Pro upgrade unlocks multi-point metering with interactive zone assignment, reciprocity correction, N-rating, development recommendations with times, and the ability to save, compare, and export calculations as images.
What film types does ZoneCalc support for reciprocity data?
ZoneCalc supports reciprocity data for films such as Ilford HP5+, FP4+, Delta 100/400, Kodak Tri-X, T-Max 100/400, Kodak Portra 160/400/800, and Leica Monopan.
How does ZoneCalc handle reciprocity correction?
For exposures over one second, ZoneCalc automatically corrects for the Schwarzschild effect using a film-specific exponent. The corrected camera time is displayed directly in the result card, with shutter speeds extending up to 30 minutes.
What is the update frequency for ZoneCalc?
ZoneCalc was last updated on August 3, 2026, indicating active development. The current version is 1.2.
Is ZoneCalc available on Android devices?
Currently, ZoneCalc is only supported on iPhone devices. It is not available for Android smartphones or tablets.
