# Silverlog Reciprocity

> Film Long Exposure Calculator

Canonical page: [https://chrome-stats.com/d/id6756740671](https://chrome-stats.com/d/id6756740671)

## Overview

- **ID:** `id6756740671`
- **Platform:** Apple
- **Type:** Apple app
- **Status:** Available
- **Publisher:** Simon Westgate
- **Category:** Photo & Video
- **Version:** 1.1.1
- **Last updated:** 2026-09-24
- **First published:** 2026-03-29
- **Size:** 28 MB
- **Data as of:** 2026-09-26
- **Store listing:** [Apple App Store](https://apps.apple.com/us/app/silverlog-reciprocity/id6756740671)
- **Website:** [https://silverlog.app](https://silverlog.app/)
- **Privacy policy:** [https://silverlog.app/privacy](https://silverlog.app/privacy)

## Description

Compensate for reciprocity failure in seconds. Select your film stock, enter your metered time, and get the corrected exposure instantly.

Silverlog Reciprocity calculates corrected exposure times for long exposures on film, compensating for reciprocity failure — the point where film loses sensitivity during extended exposures.

HOW IT WORKS
Select your film stock from a comprehensive database covering Kodak, Ilford, Fujifilm, Fomapan, CineStill, Lomography and more. Enter your metered exposure time and instantly see the compensated time you should actually use.

Calculations use manufacturer-published reciprocity data or established empirical formulas, and each correction shows which method was used: interpolation from a published data table, or a Schwarzschild exponent formula.

FEATURES
• Over 70 film stocks with reciprocity data
• Instant calculation — no submit buttons, results update live
• Method shown with each correction — data table or Schwarzschild exponent
• Built-in countdown timer for the corrected exposure
• Favourite and recent films for quick access
• Works offline — no internet connection needed
• Clean, focused interface designed for use in the field
• Dark mode support

BUILT FOR PHOTOGRAPHERS
Whether you're shooting Velvia at sunset, Tri-X under moonlight, or Delta 3200 in a cathedral, Silverlog Reciprocity gives you the corrected time without fumbling with charts or guesswork.

Part of the Silverlog photography toolkit. No account required. No data collected.

## Rankings

- #2,284,294 — Overall

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Source: [Chrome-Stats](https://chrome-stats.com/d/id6756740671)