VFD-Laz-II

Plan your starting light. Keep the conditions. Learn from your test shots. Flash Distance Calculator is an offline workbench for photographers using one manually controlled flash. It connects a guide-number calculation with saved lighting setups, equipment references and a record of what you actually used. DISTANCE Solve for flash-to-subject distance, manual power or aperture. Enter a guide number with its reference ISO and power, or select a saved optical configuration. Explore the distance response, choose a target exposure offset and see the band for your chosen EV tolerance. Declared hardware powers reveal available settings and their exposure residuals. SETUPS Save a named lighting setup with source conditions, notes and up to five subject positions. Keep successive revisions, compare two model setups and export a PDF lighting card. Reuse actual settings from a trial as a record-only setup when a GN prediction is not appropriate. FLASH KIT Keep your physical flashes and their declared manual powers together with optical configurations. Record zoom, coverage format, illumination pattern, direction and the complete modifier stack. Add a documented reference GN, or save conditions without a GN for later measurement. Published revisions preserve the reference used by earlier plans and tests. TEST SHOTS Start a test from a calculation, saved setup, optical configuration or manual log. Confirm actual settings before recording each trial. Add observations and external meter readings, retain correction history and complete or archive the session. Eligible incident flash-only readings can be reviewed to publish a new measured GN revision. Reports show sample conditions and residuals; a single measured point does not validate other distances. YOUR RECORDS Use meters or feet and choose distance display precision. Export full JSON backups and import validated copies while retaining current records and preferences. Share PDF reports and trial CSV files. CSV numeric values retain stored precision rather than display rounding. Read the privacy statement, method help, version details and licenses inside the app. MODEL SCOPE Predictions use a nominal guide-number model for one direct flash at ordinary full-pulse sync with matching optical conditions. HSS, bounce and large-modifier near-field arrangements support records without a universal distance prediction. EV tolerance is a user-selected tolerance, not a measured accuracy claim. Verify actual exposure with your equipment on location. The app does not measure light or control a flash. Meter readings are entered from an external instrument. No account is required, and core calculations and records work offline. The app interface is in English.

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