CalcuLight

An Intuitive Film Light Meter

Free · In-App Purchases · Designed for iPad. Not verified for macOS.

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

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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 .

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    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.
    Languages
    • English
    Age Rating
    4+
    In-App Purchases
    Yes
    Provider
    Li Fan
    • 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.
    Copyright
    • © Li Fan
  • Developer Website
  • Privacy Policy
  • Licence Agreement

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