CalcuLight

A powerful and intuitive light meter for film photography: Spot, matrix or calculated metering with location enabled log books. Free core features, no ads ever!

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.

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)

When enabled, displays Zone System value 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 - Choose precise or general Timestamp Notes - Notes are pre-populated with captured values in Calculated metering mode

Export your shooting log as CSV or JSON. Ideal for tracking exposures alongside film rolls.

DISPLAY OPTIONS

Light readings in EV, lux, and cd/m² Light and dark themes optimized for personalized readability 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 Theme switch

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 Global EV offset Vintage camera shutter speed control Exposure settings range limits And more

Free version is ALWAYS good to have on your phone, in case your handheld or hot shoe mounted light meter fails. You can try Pro version at no cost for 14-days. After that, you can access the Pro version in two ways: Pay as you go for only $0.99 USD per month to access all Pro features; or pay $14.99 USD for lifetime access to all Pro features and future updates.

Privacy Policy: https://calculight.ocutrain.com/privacy-policy.html

Terms of Service: https://calculight.ocutrain.com/terms-of-service.html