# Actinic: Exposure Calculator

> Reciprocity Failure, Offline

Canonical page: [https://chrome-stats.com/d/id6787106769](https://chrome-stats.com/d/id6787106769)

## Overview

- **ID:** `id6787106769`
- **Platform:** Apple
- **Type:** Apple app
- **Status:** Available
- **Publisher:** 永 张
- **Category:** Utilities
- **Version:** 1.0.2
- **Last updated:** 2026-08-27
- **First published:** 2026-07-09
- **Size:** 841 KB
- **Data as of:** 2026-09-21
- **Store listing:** [Apple App Store](https://apps.apple.com/us/app/actinic-exposure-calculator/id6787106769)
- **Website:** [https://obelisk.club/filmexposurecalculator](https://obelisk.club/filmexposurecalculator)
- **Privacy policy:** [https://obelisk.club/filmexposurecalculator/privacy](https://obelisk.club/filmexposurecalculator/privacy)

## Description

Actinic is a fast, fully offline exposure calculator built for film photographers — a film exposure calculator that also solves the one thing most light-meter apps skip: reciprocity failure on long exposures.

Dial in a Sunny 16 reading or your own aperture, shutter, and ISO, then read the full wheel of equivalent exposures instantly — no camera permissions, no accounts, no network calls, ever.

Shooting past a second? Pick your film stock — Tri-X, HP5 Plus, T-Max, Portra, Acros, and more — and Actinic corrects your exposure time for reciprocity failure using published manufacturer data, so your night shots and long exposures come out right the first time.

Included:
• Full-stop exposure wheel with Sunny 16 quick-set
• Reciprocity calculator with 3 built-in film stocks
• Save up to 3 camera + film presets

Actinic Pro unlocks the full 12-stock reciprocity library, unlimited saved presets, and third-stop precision to match modern camera dial clicks exactly — one-time purchase, yours forever.

Terms of Use (EULA): https://obelisk.club/filmexposurecalculator/terms

## Rankings

- #1,392,773 — Overall

## Similar extensions and apps

- [Expose — Exposure Calculator](https://chrome-stats.com/d/id6760650330)
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- [Reciprocity Plus](https://chrome-stats.com/d/id898649178) — 4.10 / 5
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- [Sunny16 exposure calculator](https://chrome-stats.com/d/id520156440) — 4.80 / 5
- [Light Meter: Film Photography](https://chrome-stats.com/d/id6790240977) — 5.00 / 5
- [Sunny 16 - Film Meter](https://chrome-stats.com/d/id6757172843)
- [Light Meter Ultra](https://chrome-stats.com/d/id1558108173) — 4.70 / 5
- [Apperture: Film Simulation](https://chrome-stats.com/d/id6761656883)

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Source: [Chrome-Stats](https://chrome-stats.com/d/id6787106769)