Roshutsucho - Film Exposure

📷 Roshutsucho - Professional Photography Exposure Calculator

A comprehensive exposure calculation app designed for film photography enthusiasts and professional photographers. Integrates Sunny 16 rule, reciprocity failure compensation, push/pull processing, ND filters, bellows correction, and flash guide number calculations into one powerful tool.

✨ KEY FEATURES

【FREE FEATURES】
• Sunny 16 Calculator
- Calculate proper exposure by selecting light conditions
- 7 lighting scenarios (bright sun to night scenes)
- Display all aperture/shutter speed combinations for your ISO

• ND Filter Calculator
- Support ND2 to ND100000
- Multiple filter stacking calculations
- Auto-calculate corrected exposure time

• EV/LV Converter
- Convert between exposure values
- Understand relationships between aperture, shutter speed, and ISO

【PRO FEATURES - $7.99 One-Time Purchase】
• Reciprocity Failure Compensation ⭐
- 20+ major film stocks supported
- Accurate reciprocity characteristics data
- Auto-calculate corrected times for long exposures
- Supported films: Kodak Portra, Ektar, T-MAX, Tri-X, Ilford HP5, Delta, Fujifilm Provia, Velvia, Acros, and more

• Push/Pull Processing Calculator
- Push +1 to +3 stops, Pull -1 to -3 stops
- Calculate effective ISO ratings
- Consider exposure compensation for development

• Bellows Correction
- Support macro and large format photography
- Calculate exposure factor from lens focal length and bellows extension
- Display correction in stop values

• Flash Guide Number Calculator
- Calculate proper aperture from guide number
- Consider shooting distance and ISO sensitivity
- Support multi-light setups

• Integrated Calculator
- Chain calculations: Sunny 16 → ND → Reciprocity
- Handle complex shooting conditions in one go
- Display step-by-step calculation process

• Custom Film Registration (Coming Soon)
- Add your own film data
- Customize reciprocity curves

• Presets & History (Coming Soon)
- Save frequently used settings
- Export calculation history to CSV

🎯 PERFECT FOR

• Medium and large format film photographers
• Long exposure and astrophotography enthusiasts
• Landscape photographers using ND filters
• Macro photographers with bellows/extension tubes
• Professionals requiring precise exposure control
• Home film developers

📱 APP FEATURES

• Fully Offline - Works without internet connection
• Dark Mode - Optimized for low-light viewing
• Simple UI - Intuitive operation for quick calculations
• Bilingual - Japanese and English fully supported
• Ad-Free - One-time purchase, no subscriptions

💡 USAGE EXAMPLES

【Example 1: Long Exposure】
1. Calculate base exposure with Sunny 16
2. Apply ND1000 filter correction
3. Compensate reciprocity failure for 30-second exposure
→ Actual shutter time: 42 seconds

【Example 2: Push Processing】
1. Shooting ISO 400 film at ISO 1600
2. Planning to push +2 stops in development
3. Confirm effective ISO while determining exposure

【Example 3: Macro Photography】
1. 90mm lens focal length, 180mm bellows extension
2. Bellows correction reveals +2 stops needed
3. Select appropriate aperture and shutter speed

🔒 PRIVACY

• No personal information collected
• All data stored locally on device
• Only purchase information securely managed

📖 TECHNICAL SPECS

• OS Requirements: iOS 15+ / Android 6.0+
• Languages: Japanese, English
• Size: ~45MB
• Offline: Fully supported

🌟 VJ-CONNECT Photography Series #1

Roshutsucho is the first in VJ-CONNECT's professional photographer tool series. Combining accurate data with user-friendly interface to support your photography workflow.

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