Film Photography Tools
35mm.fyi
A comprehensive utility for analog photographers — covering everything from metering and exposure to film development and roll logging.
Available on iOS, Android & Web
What's Inside
Eight precision tools
Exposure Calculator
Calculate correct exposure from EV, ISO, and aperture or shutter priority. Full Zone System support for fine-art black and white work.
Film Dev Timer
Three-phase guided timer for Developer, Stop Bath, and Fixer with visual warnings and automatic phase transitions.
DOF Calculator
Depth of field, hyperfocal distance, and field of view for 35mm, 6x6, and 6x9 formats with bellows extension compensation.
Negative Inverter
Invert film negatives using your device camera or library. GPU-accelerated editor with brightness, contrast, and warmth controls.
Reciprocity Calculator
Correct for reciprocity failure on long exposures across 30+ film stocks. Power-law and lookup-table models with source citations.
Filter Calculator
Exposure compensation for optical filters — contrast, ND, polarizer, conversion, warm/cool, and infrared with Wratten designations.
Sunny 16 & Zones
Sunny 16 rule reference across 13 light conditions with ISO-adjusted combos, plus the full Ansel Adams 11-zone scale.
Roll Log
Log and manage film rolls with per-frame metadata, exposure settings, sketch canvas, and export to clipboard or share sheet.
See It In Action
Designed for the darkroom
Swipe to explore →