# Roshutsucho: Exposure & ND — Film correction & bulb timer

> Film correction & bulb timer (iPhone/iPad app by Hiroyuki Yamamoto.)

- Source: https://appshunter.io/ios/app/roshutsucho-exposure-and-nd/id6769304650 (this page in markdown: same URL + `.md`)
- Developer: [Hiroyuki Yamamoto](https://appshunter.io/developer/1893275804)
- Category: Photo & Video, Utilities
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 15.0 · 43 MB
- Languages: American English
- Released: 2026-05-19
- Data updated: 2026-10-12

## What is Roshutsucho?

How long with an ND filter? How much extra exposure does your film need?
Roshutsucho brings exposure calculations and a timer together for film and digital photography.

FREE TO USE
• ND filter calculator: calculate exposure times for ND2 through ND1000
• Exposure timer: start from a calculated result, pause and resume, and enable a completion alert
• Sunny 16: find aperture and shutter speed combinations for ISO and light conditions
• EV/LV converter: explore the relationship between exposure values and camera settings
• Restore your previous settings for the next shoot

PRO — ONE-TIME PURCHASE
• Integrated calculator: start with a metered exposure or Sunny 16, apply ND compensation, then film reciprocity correction. See each step and the final time
• Named presets: save and recall multiple shooting setups
• Reciprocity correction: estimate longer exposures for the included film stocks
• Push/pull calculations, bellows extension correction and flash guide number calculations

Pro is a one-time purchase, not a subscription. The purchase screen shows the current local price. Purchase restoration is supported.

MADE FOR THE FIELD
A dark interface with English and Japanese support. Calculations, presets and the timer work offline; purchases and restoration require a connection. No ads or account registration. Optional usage sharing is off by default.

Roshutsucho is a calculation tool. It does not measure light with your camera or remotely operate the shutter. Film correction is an estimate: consult film documentation and account for your shooting conditions. The timer supports 1 second to 24 hours. Completion alerts require notification permission; sound may be affected by silent mode, Focus or other device settings.

Support: support@vjconnect-software.com

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Roshutsucho Pro | $4.99 | one-time |


## Is Roshutsucho safe?

Not enough ratings yet to assess Roshutsucho.

## Is Roshutsucho legit?

Roshutsucho: Exposure & ND appears legitimate, with a few gaps. The AppsHunter Legitimacy Score for Roshutsucho is 65 out of 100 points across 7 verification signals from App Store and developer data.


## Version history (last 2 releases)

### 1.1 — 2026-09-28

• Added an exposure timer with pause, resume and completion alerts
• Added the Pro integrated calculator and named presets
• Restore your previous settings
• Improved ND layout, purchases and restoration
• Review requests appear at a natural break after continued use

### 1.0.0 — 2026-05-19

No release notes.

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## More apps by Hiroyuki Yamamoto

- [PocketTune - 8bit Music Maker](https://appshunter.io/ios/app/pockettune-8bit-music-maker/id6762185647)
- [MediWords - 医療英単語](https://appshunter.io/ios/app/mediwords/id6764850304)
- [Film Techō - Film Journal](https://appshunter.io/ios/app/film-techo-film-journal/id6775870582)
- [Dottie - Pixel Art Editor](https://appshunter.io/ios/app/dottie-pixel-art-editor/id6807859477)
- [Mizube Biyori](https://appshunter.io/ios/app/mizube-biyori/id6808970411)

All apps by Hiroyuki Yamamoto: https://appshunter.io/developer/1893275804

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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 2026-10-12.*