Light Meter

WBPhoto

About this app

The essential light meter app for film and digital photography. Turn your phone into a precision spot meter trusted by 400,000+ photographers worldwide.

PRECISION EXPOSURE METERING
• Spot meter with tap-to-focus exposure points
• Multi-point spot metering — pin and compare dynamic range
• Zone System metering — assign zones (0–X) to readings
• Exposure preview for compensation and ND offsets
• Incident light meter via device sensor
• Volume button to start/stop metering
• Calibrated against professional Gossen and Sekonic meters

ZONE PLACEMENT CALCULATOR
• Place readings on zones, see target exposure instantly
• Grayscale swatches show how each reading renders
• Dynamic range warnings for high-contrast scenes
• Send directly to Bracket Calculator

AR RANGEFINDER
• Point at your subject, read distance in feet or meters
• Perfect for manual focus film cameras with no built-in rangefinder
• Uses ARCore Depth API on supported devices for accurate readings
• Precise mode for the exact number; Zone mode for macro/near/mid/far
• Send readings directly into the Depth of Field Calculator

YOUR COMPLETE PHOTOGRAPHY TOOLKIT — 13 CALCULATORS
• Rangefinder — AR subject-distance measurement
• DOF — Hyperfocal distance, near/far focus limits
• Reciprocity — 40+ film stocks (Portra, Tri-X, HP5, CineStill, and more)
• Bracket Calculator — Exposure bracketing with custom steps
• Pinhole Calculator — Effective f-stop for pinhole cameras
• EV/LV Converter • White Balance • Bellows Factor
• Flash Guide Number • EXIF Reader • Angle of View
• Zone Placement • Sunny 16

GOLDEN HOUR & BLUE HOUR
• Sunrise, sunset, golden hour, and blue hour times

PROFESSIONAL FEATURES
• Custom ISO, shutter, f-stop ranges
• Half-stop and third-stop increments
• Shutter angle mode for cinematographers
• Live histogram • ND filter display
• Foot-candles and Lux • Exposure timer
• Screen lock to keep display awake

SAVE & ORGANIZE
• Log exposures with GPS and notes
• Hardware profiles for your gear
• Export and reference past readings

Film SLR • Medium format • Large format • Pinhole • Digital mirrorless
50+ languages • No internet required for metering

Ratings and reviews

I think it's a pretty good app. I've shot about 10 rolls of film using it and very rarely had exposure issues. I'm knocking off a point because the camera sensor is the most used app and in the top right corner. if you could sort apps I would give it 5 stars. I have a taller phone (S24 ultra) and have to use two hands to get to the camera sensor as is.

Didn't work. My phone is a galaxy s20 ultra and the numbers this app was giving me were way off. I pointed my phone at a very brightly lit space, set the f stop and iso accordingly, but the calculated shutter speed was ten seconds. I tried to fix it, but nothing I did made the app give me correct calculations. I don't know if it was a problem with my phone or the app itself, but unfortunately it's useless if it doesn't give me the right settings.

Lots of functionality, but not sure of the accuracy. I compared it with a Gossen Luna Pro with the adapters from CRIS Camera, my old manual SLR with a Wein cell, and a Gossen Luna Pro SBC with a 9v battery. The camera and both the Luna Pros were within 1/2 stop every time, but this app was always off by over a stop or more. In the end, it always comes down to seeing how your camera shoots with the settings the meter suggests, then adjusting accordingly...

What’s new

• AR Rangefinder — measure subject distance for manual film cameras (ARCore)
• Send rangefinder readings directly into the DoF Calculator
• Multi-Point Spot Metering
• Zone Placement Calculator
• Bracket & Pinhole Calculators
• Zone System metering
• Exposure Preview
• 20+ new film stocks
• Volume button metering
• Bug fixes & improvements