TimerGlass

TimerGlass is a field companion for film photographers—reciprocity correction, pinhole geometry, exposure calculations and a long-exposure timer, together in one quiet, focused app. From metering and compensation to timing and recording your exposure, keep your attention on the scene in front of you. What you can do • Correct for reciprocity failure Choose from over 80 film and photographic paper profiles, including Ilford, Kodak, Fujifilm, Foma, Rollei, ADOX, CineStill and Lomography. See the distinction between manufacturer data, derived estimates and reference models. Explore exposure curves and identify results beyond published data ranges. • Combine filters and bellows compensation Stack ND filters and account for bellows extension in a single exposure calculation. Clear inputs, a bellows diagram and a calculation breakdown help you understand each adjustment. • Plan pinhole photographs Use Rayleigh’s theoretical optimal pinhole diameter as a reference, or enter your measured diameter. Calculate the effective f-number and horizontal, vertical and diagonal angles of view. Choose a standard format or enter custom image dimensions. Diagrams and formulas explain the geometry, diffraction and effects of pinhole size. Estimate exposure using Sunny 16 and lighting conditions, or enter a meter reading’s aperture, shutter speed and ISO. TimerGlass converts the reading and applies the film’s reciprocity correction. • Time long exposures Send your calculated exposure directly to the timer. Pause, resume and receive an exposure-complete notification. Follow the countdown on your Lock Screen with Live Activities, or in Dynamic Island on supported devices. • Reuse setups and bracket exposures Save shooting presets and restore either the complete setup or just the equipment parameters. Compare exposure times across films and plan 3- or 5-frame brackets, with reciprocity correction calculated separately for every frame. • Record and review your photographs Keep exposure settings alongside camera, lens, location, notes and processing results. Search, filter and group records, or reuse an earlier setup for your next photograph. • Consult long-exposure guidance Get reminders about contrast and development considerations for black-and-white film, and color shifts in color film, based on film type and exposure time. Use them alongside film-specific technical information when planning your tests. • Customize and back up Create custom film curves using a power-law model or a data table, and add your own filters. Back up and restore your data, export shooting records as CSV, and share exposure cards. Who it’s for Large-format and pinhole photographers making long exposures, 35mm and 120 film users chasing dusk and night scenes, and anyone who would rather photograph than search through technical sheets by flashlight. Supported languages English, Simplified Chinese, Traditional Chinese, Japanese, German, French, Spanish and Korean. Privacy No account required. TimerGlass does not collect personal data. Shooting records and custom settings are stored locally on your device. You choose when to export backups or share them.