# TimerGlass — Reciprocity Failure Calculator > Reciprocity Failure Calculator (iPhone/iPad app by 存滨 崔.) - Source: https://appshunter.io/ios/app/timerglass/id6761681913 (this page in markdown: same URL + `.md`) - Developer: [存滨 崔](https://appshunter.io/developer/1809703940) - Category: Photo & Video, Utilities - Price: $7.99 - Age rating: 4+ - Requires: iOS 17.0 · 4 MB - Languages: American English, German (Germany), Chinese (Traditional, Taiwan), Chinese (Simplified, China), French (France), Japanese - Released: 2026-04-07 - Data updated: 2026-08-31 - User reviews in markdown: https://appshunter.io/ios/app/timerglass/id6761681913/reviews.md ## What is TimerGlass? TimerGlass is the field companion for film photographers — reciprocity, pinhole geometry, exposure estimation, and a beautiful timer, all in one quietly designed app. WHAT IT DOES • Reciprocity failure correction for 100+ film stocks (Ilford, Kodak, Fuji, Foma, Rollei, ADOX, CineStill, Lomography and more) — built from manufacturer data sheets. • ND filter stack and bellows extension compensation are folded into the same calculation. • Pinhole camera tool — Lord Rayleigh's optimal aperture, effective f-number, equivalent angle of view by film format, and Sunny-16 exposure estimation that flows straight into the timer. • Long-exposure timer with Live Activity and Dynamic Island, accurate even when your phone is locked. • Long-exposure side-effects advice — pull-development guidance for B&W, color-shift tips for negative and slide film, contextual to your actual exposure time. • History of recent exposures with all the parameters you used. • Custom film stocks — define your own with power-law or lookup-table reciprocity curves. DESIGNED FOR Large-format and pinhole photographers who do long exposures often, 35mm and medium-format shooters chasing dusk and night scenes, and anyone tired of squinting at a film data sheet by torchlight. LANGUAGES English, 简体中文, 繁體中文, 日本語, Deutsch, Français. PRIVACY TimerGlass collects nothing. Everything you do stays on your device. ## Version history (last 5 releases) ### 1.6 — 2026-08-04 Reciprocity data, rebuilt • Dozens of films recalculated from Kodak, Fujifilm, Ilford/Harman, Foma and other maker datasheets • Every film shows its source; you'll be told when a result goes past the published range A clearer result • The result card is now a ledger: metered time, filters, bellows, and reciprocity — each step on its own line Better metering input • Metered time uses a standard shutter dial (including 1/125 and friends), with a keypad for exact values More accurate corrections • Graduated ND (GND) no longer adds to whole-frame exposure — it darkens the sky, not the whole sheet • Calculation order and thresholds aligned with how the datasheets actually read Take your data with you • Export and import exposure history and custom films, so your own curves survive a new phone ### 1.5 — 2026-07-22 NEW: Dark Mode • A warm, darkroom-inspired palette that's easy on the eyes at night • Choose System, Light, or Dark in Settings — takes effect instantly • The Lock Screen timer card adapts automatically Works with MeterGlass • Jump to MeterGlass from the Calculator to meter a scene — your film's ISO comes along automatically • The measured shutter time returns straight to the Calculator, snapped to the nearest stop Standalone Timer • Set a duration right on the Timer tab — no need to go through the Calculator Better Custom Films • Lookup-table films now accept your own data points, so corrections match your film's measured behavior ### 1.4 — 2026-07-06 What's new in 1.4 • Shutter-synced timer — "Set Timer" now arms the exposure; tap the big start button the moment you open the shutter, so the countdown matches your actual exposure. Stop requires a 1-second hold. • Timer survives everything — if iOS kills the app mid-exposure, reopening restores the running countdown. Stale notifications are cleaned up automatically. • Smarter alerts — no more duplicate reminders once you've seen the exposure finish. • Custom filters — add variable NDs or old filters with their measured light loss. • Share preview — see the exposure card before sharing, now with a scan-to-download QR code. • Refreshed result panel — dial-style readout with the corrected time, right beside the start button. • History grouped by date, and the pinhole tool remembers your settings. ### 1.3 — 2026-06-16 What's new in 1.3 • Share cards — turn any exposure into a vintage card and share it (or save to Photos), from the calculator, pinhole tool, and history. • Reciprocity curve — tap the selected film to see its metered-to-corrected exposure curve at a glance. • Timer keeps the screen awake during an exposure, and "Stop" now needs a 1-second hold so a stray tap can't ruin a long shot. • Stronger completion alerts: time-sensitive notification plus follow-up reminders, a completion sound, and a final-3-second countdown buzz. • "One more" button to instantly repeat the same exposure. • Fixed the Live Activity / Dynamic Island lingering at 0:00 after finishing; it now shows a proper "complete" state. • History: edit notes, and pinhole shots are now saved and marked. • Pinhole share cards now include focal length, film format, and aperture. • Updated film data (Harman Phoenix II, Kentmere Pan series) and assorted polish. ### 1.2 — 2026-04-24 v1.2 brings TimerGlass closer to "everything you need at the camera, in one app." • NEW Pinhole tool — design the optimal pinhole for any focal length, verify an existing one, and get Sunny-16 exposure estimates that flow straight into the timer. • NEW Live Activity & Dynamic Island — your countdown stays visible on the lock screen and Dynamic Island during long exposures. • NEW Long-exposure side-effects advice — pull development guidance for B&W, color shift tips for negative & slide film. • Timer is now rock-steady in the background — no more drift after locking the screen. • TimerGlass now remembers your last selected film between launches. ## More apps by 存滨 崔 - [GroundGlass](https://appshunter.io/ios/app/groundglass/id6747068863) - [FieldGlass](https://appshunter.io/ios/app/fieldglass/id6761699291) - [MeterGlass](https://appshunter.io/ios/app/meterglass/id6761722905) - [DevGlass](https://appshunter.io/ios/app/devglass/id6762206948) - [MatGlass](https://appshunter.io/ios/app/matglass/id6762502630) All apps by 存滨 崔: https://appshunter.io/developer/1809703940 --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-31.*