Roshutsucho -

Roshutsucho - The Essential Exposure Calculator for Film Photographers

Master exposure calculations for film and digital photography with precision and ease. From Sunny 16 basics to advanced reciprocity failure corrections, Roshutsucho is your complete toolkit for perfect exposures every time.

WHAT IS ROSHUTSUCHO?

Roshutsucho means "Exposure Notebook" in Japanese. Designed specifically for film photography enthusiasts and professional photographers, this app combines classic exposure calculation methods with modern convenience. Whether you're shooting 35mm, medium format, or large format film, Roshutsucho helps you achieve accurate exposures in any situation.

FREE FEATURES

SUNNY 16 CALCULATOR Calculate perfect exposures using the classic Sunny 16 rule. Adjust ISO, weather conditions, and get instant shutter speed and aperture recommendations.

ND FILTER CALCULATOR Quickly calculate exposure adjustments for ND filters. Supports ND2 through ND100000 and custom density values. Perfect for long exposure photography.

EV/LV CONVERTER Convert between Exposure Value (EV) and Light Value (LV) systems. Understand the relationship between aperture, shutter speed, and ISO.

PRO FEATURES (One-time purchase)

RECIPROCITY FAILURE CORRECTION Film-specific reciprocity failure data for 20+ popular film stocks including:

• Kodak: Portra 160/400/800, Ektar 100, T-Max 100/400, Tri-X 400
• Fujifilm: Provia 100F, Velvia 50/100, Acros 100
• Ilford: HP5 Plus, FP4 Plus, Delta 100/400, Pan F Plus
• CineStill: 50D, 800T
• And more!

Get accurate exposure times for long exposures from 1 second to several minutes.

PUSH/PULL PROCESSING Calculate exposure adjustments for push and pull processing. Support for plus or minus 3 stops adjustment. Essential for creative control and low-light shooting.

BELLOWS EXTENSION CORRECTION Calculate exposure compensation for bellows extension in large format and macro photography. Accounts for light falloff due to lens-to-film distance.

FLASH GUIDE NUMBER CALCULATOR Determine aperture based on flash guide number and subject distance. Supports both metric and imperial units.

INTEGRATED CALCULATOR Combine multiple calculations in a single workflow: Sunny 16 to ND Filter to Reciprocity Failure Perfect for complex shooting scenarios.

WHO IS THIS FOR?

• Film photography enthusiasts
• Large format photographers
• Professional photographers shooting film
• Photography students learning exposure fundamentals
• Anyone who loves analog photography

TECHNICAL FEATURES

• Clean, intuitive interface optimized for quick calculations
• Dark mode support for comfortable viewing in any lighting
• Bilingual support (English/Japanese)
• No ads, no tracking, no subscriptions
• All data stored locally on your device
• Works offline - no internet connection required
• One-time purchase - pay once, own forever

PRIVACY FIRST

Your privacy matters. Roshutsucho:

• Does NOT collect personal information
• Does NOT require account creation
• Does NOT show advertisements
• Does NOT track your location
• Stores all calculation data locally on your device

WHY ROSHUTSUCHO?

Unlike generic light meter apps, Roshutsucho is purpose-built for film photographers who need accurate, film-specific calculations. The reciprocity failure data is based on manufacturer specifications and real-world testing, ensuring reliable results for your precious film shots.

Whether you're shooting landscapes with a view camera, portraits on medium format, or street photography on 35mm, Roshutsucho provides the calculations you need to nail your exposures.

SUPPORT

Questions or feedback? We would love to hear from you! Email: support@vjconnect-software.com Web: https://vjconnect-software.com

Download Roshutsucho today and take control of your film photography exposures!