# Lumen Forge: Exposure Planner — Match ISO, aperture and ND

> Match ISO, aperture and ND (iPhone/iPad app by Robert Corbin.)

- Source: https://appshunter.io/ios/app/lumen-forge-exposure-planner/id6771018028 (this page in markdown: same URL + `.md`)
- Developer: [Robert Corbin](https://appshunter.io/developer/1890247992)
- Category: Photo & Video
- Price: $0.99 (on sale, was $3.99)
- Age rating: 4+
- Requires: iOS 17.0 · 27 MB
- Languages: American English
- Released: 2026-05-20
- Data updated: 2026-10-06
- User reviews in markdown: https://appshunter.io/ios/app/lumen-forge-exposure-planner/id6771018028/reviews.md

## What is Lumen Forge?

Exposure Match transfers a reference exposure to a different ISO, aperture and ND stack, then builds a bracket plan with explicit shutter times.

HOW IT WORKS
1. Open Match. Enter a reference ISO, aperture and shutter speed, or capture the last available meter reading.
2. Set your target ISO and aperture. Add ND filters and adjust exposure compensation.
3. Choose a bracket count and spacing. Review each shutter time and share the plan, including long-exposure and shutter-limit flags.

Exposure triangle, Kelvin references, zone notes, flash calculations, saved recipes, Field Pack and advanced tools remain available in a five-tab layout. ISO equivalence math is corrected, and the exposure triangle holds its reference while you change a setting.

WHAT TO KNOW
The camera meter estimates reflected scene light. Lux estimates assume an 18% gray subject and are not a calibrated incident-meter reading. ND effects use entered stop values. Brackets list shutter-open time, excluding camera delays. Verify the result with your camera and actual filters.

iPhone and iPad.


## Version history (last 5 releases)

### 3.0.1 — 2026-09-30

A clearer App Store name and search details. No other changes in this update.

### 3.0 — 2026-09-13

Exposure Match

Exposure Match transfers a reference exposure to a different ISO, aperture and ND stack, then builds a bracket plan with explicit shutter times.

1. Open Match. Enter a reference ISO, aperture and shutter speed, or capture the last available meter reading.
2. Set your target ISO and aperture. Add ND filters and adjust exposure compensation.
3. Choose a bracket count and spacing. Review each shutter time and share the plan, including long-exposure and shutter-limit flags.

The camera meter estimates reflected scene light. Lux estimates assume an 18% gray subject and are not a calibrated incident-meter reading. ND effects use entered stop values. Brackets list shutter-open time, excluding camera delays. Verify the result with your camera and actual filters.

### 2.2 — 2026-08-20

Adds Field Pack with exposure-readiness scoring, support, gel, ND, and bracket guidance, a copyable shot brief, and ten offline reference sheets for field lighting decisions.

### 2.1 — 2026-06-30

Version 2.1 adds Field Pack: a shot-brief planner with readiness scoring, ND/gels/bracket/support recommendations, copyable production notes, and ten high-resolution offline reference sheets for exposure, lighting ratios, Zone System placement, ND, gels and mired correction, cinema shutter angle, macro bellows, film reciprocity, location scouting, and keeper-frame prep.

Also includes updated screenshots and metadata to show the current app UI and Field Pack workflow.

### 2.0 — 2026-06-24

Lumen Forge 2.0 — eight new pro tools join the light meter, still 100% offline.

• Lighting Ratio: stops or apertures to a key:fill ratio, ASC ratio, and contrast band.
• Inverse Square: a falloff curve, remaining-light percentage, and the aperture compensation to hold exposure.
• Bellows Factor for macro: extension or magnification to a corrected f-number and shutter.
• Gel Balance: Kelvin to mired with the closest CTO/CTB gel recommendation.
• Dynamic Range (SBR): add spot readings for a stops measurement, a zone-placement strip, and a grad-ND / bracket plan.
• Flash Balance, Grey-Card Compensation, and an EV↔lux reference chart.

All APEX and optics math is computed on-device and oracle-verified. No account, no network — everything stays on your device.

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## More apps by Robert Corbin

- [Daily Word Journey](https://appshunter.io/ios/app/daily-word-journey/id6761548266)
- [Hush Secret Text](https://appshunter.io/ios/app/hush-secret-text/id6761658175)
- [Renew Guard](https://appshunter.io/ios/app/renew-guard/id6761755447)
- [Receipt to PDF](https://appshunter.io/ios/app/receipt-to-pdf/id6761782025)
- [Route Your Pay](https://appshunter.io/ios/app/route-your-pay/id6761783719)
- [Tip Arbiter](https://appshunter.io/ios/app/tip-arbiter/id6761786879)

All apps by Robert Corbin: https://appshunter.io/developer/1890247992

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-10-06.*