An intuitive and powerful light meter for film photography. Spot, center, matrix & multi-point metering, Zone System display, and location enabled log book.
CalcuLight is a powerful and intuitive light meter app designed for film photographers who use manual focus cameras without a built in meter, or who want more advanced metering capabilities than their camera can offer.
Turn your iPhone into a precision light meter tailored for 35mm, medium format, and large format photography.
METERING MODES
Center Weighted
Classic center focused metering (approximately 30 degree field of view), similar to vintage film cameras.
Matrix
Full frame averaging for evenly lit scenes. Uses EXIF data for fast and accurate readings.
Spot (Pro)
Measure a precise 5% area of the frame. Tap anywhere to position the metering point.
Calculated (Pro)
Tap up to five areas and receive an averaged exposure reading. Ideal for high contrast scenes and Zone System workflows.
EXPOSURE CONTROLS
Shutter Priority
Set your shutter speed. CalcuLight calculates the aperture.
Aperture Priority (Pro)
Set your aperture. CalcuLight calculates the shutter speed.
EV Compensation (EV±)
Per shot exposure adjustment in full, half, or third stops.
ISO, shutter, and aperture values are available in full, 1/2, or 1/3 stop increments.
ZONE SYSTEM (Pro)
Includes Ansel Adams Zone System overlay, showing the current zone from 0 to X alongside your reading.
In Calculated mode, each metering point displays its own zone value for advanced exposure control.
LIVE HISTOGRAM (Pro)
Real time RGB histogram overlay to detect clipped highlights and blocked shadows before you shoot.
Toggle between combined RGB, red, green, and blue channels.
LOG BOOK (Pro)
Save every reading with:
Full exposure data
Metering mode
GPS location
Timestamp
Notes
Export your shooting log as CSV or JSON. Ideal for tracking exposures alongside film rolls.
DISPLAY OPTIONS
Light readings in lux, EV, and cd/m²
Light and dark themes optimized for outdoor visibility
Adjustable overlay transparency
Portrait and landscape support
12 LANGUAGES
English
简体中文
繁體中文
日本語
한국어
हिन्दी
Русский
Deutsch
Français
Español
Português
Nederlands
FREE vs PRO
Both versions are fully functional.
Free version features:
Center Weighted metering
Matrix metering
Shutter Priority
EV compensation
Single metering mode
Pro version will unlock:
All free version features
Spot metering
Calculated metering
Aperture Priority
Vintage camera shutter speed options
Zone System overlay
Live histogram
Log book with optional GPS location recording
Continuous metering
Light theme
Global EV offset
Vintage camera shutter speed control
Exposure settings range limits
And more
Free version does not cost anything to use.
You can purchase the Pro version in two ways: Pay as you go for only $0.99 USD per month to access all Pro features. Or pay a one time fee of $14.99 USD for lifetime access to all Pro features.
Privacy Policy:
https://calculight.ocutrain.com/privacy-policy.html
Terms of Service:
https://calculight.ocutrain.com/terms-of-service.html
Ratings & Reviews
This app has not received enough ratings or reviews to display an overview.
The developer, Li Fan, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Privacy practices may vary based, for example, on the features you use or your age. Learn More
The developer indicated that this app supports the following accessibility features. Learn More
Supported Features
Dark Interface
Information
Size
41.3 MB
Category
Photo & Video
Compatibility
Requires iOS 15.1 or later.
iPhone Requires iOS 15.1 or later.
iPad Requires iPadOS 15.1 or later.
iPod touch Requires iOS 15.1 or later.
Mac Requires macOS 12.0 or later and a Mac with Apple M1 chip or later.
Li Fan has not identified itself as a trader for this app. If you are a consumer in the European Economic Area, consumer rights do not apply to agreements between you and the provider.