Flash Power App

Get the right flash power setting every time. Flash Power measures the distance
from flash to subject, then calculates the precise power setting for perfect exposure.

Works with Any Manual Flash

Pre-configured for Camtraptions F1, Z1/Z2, and Z Pro — but works with any manual flash.
Just enter your flash’s guide number in settings and you’re ready to go.

Works on All iPhones

  • LiDAR-equipped iPhones (Pro models) — instant, accurate distance measurement
  • Other iPhones — surface detection with ARKit, plus manual distance entry
  • No LiDAR? No problem — measure with a tape and enter the distance directly

Built for Camera Trappers

Designed for wildlife photographers using off-camera flash. No more test shots,
no more guesswork, no more blown highlights or underexposed subjects.

How It Works

  1. Point your phone where your flash will be aimed
  2. The app measures (or you enter) the distance to your subject
  3. Set your camera’s aperture and ISO
  4. Read the recommended flash power

The app shows you exactly what power to dial in — from full power down to 1/128,
with ⅓-stop precision.

Features

  • Distance measurement — LiDAR, ARKit surface detection, or manual entry
  • Pre-configured for Camtraptions flashes — F1, Z1/Z2, and Z Pro
  • Custom guide number — use any manual flash
  • Zoom head compensation — 24mm to 200mm coverage
  • Real-time calculation — adjust settings and see power update instantly
  • Coverage preview — visualise your flash spread

The Science

Flash Power uses the guide number formula and inverse square law to calculate exposure.
It accounts for your aperture, ISO, flash zoom position, and distance. The result is a
precise power recommendation that gets you in the ballpark on your first shot.

Requirements

  • iOS 17 or later
  • LiDAR sensor recommended for best experience (iPhone 12 Pro and later Pro models)

Perfect for camera trap setups, macro photography, studio work, or any situation where
you need repeatable flash exposures.

Coming Soon