TimerGlass
Reciprocity Failure Calculator
$9.99 · Designed for iPad. Not verified for macOS.
v1.2: pinhole designer + Sunny-16 exposure estimator, Dynamic Island Live Activity timer, and long-exposure dev/color-shift advice. Built for film photographers.
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.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
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.
The developer, 存滨 崔, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- 存滨 崔
- Size
- 3.2 MB
- Category
- Photo & Video
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - iPad
Requires iPadOS 17.0 or later. - Mac
Requires macOS 14.0 or later and a Mac with Apple M1 chip or later.
- iPhone
- Languages
English and 5 more
- English, French, German, Japanese, Simplified Chinese, Traditional Chinese
- Age Rating
4+
- 4+
- Copyright
- © 2026 TimerGlass
