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
1.3
October 16, 2026
New in 1.3: metering with the iPhone camera (Pro). • Capture the scene and tap up to five measuring points into the image. The reading is taken from the camera's RAW image, not from the displayed photo. • One tap transfers the reading to the calculator: two points on Zones II and VIII go to Classic, more points go to Multi. • Calibration with a grey card against your spot meter, so the absolute value is verified too. • Camera readings are saved to the history with image and measuring points. Also: extended help and ready for iOS 27. Fixed: shutter speeds from 1/1000 display in full again, and dates follow your device language.
MoreSubscriptions & In-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.
