# AstroFlashTimer — Precise Timing Flash > Precise camera LED flash timestamping for astronomical video recordings. (iPhone/iPad app by John Grismore.) - Source: https://appshunter.io/ios/app/astroflashtimer/id1361880910 (this page in markdown: same URL + `.md`) - Developer: [John Grismore](https://appshunter.io/developer/948492187) - Category: Education - Price: Free - Rating: 5.00/5 from 1 App Store ratings - Age rating: 4+ - Requires: iOS 9.0 · 17 MB - Languages: English - Released: 2018-06-03 - Data updated: 2026-06-25 - Monetization: free - User reviews in markdown: https://appshunter.io/ios/app/astroflashtimer/id1361880910/reviews.md ## What is AstroFlashTimer? AstroFlashTimer provides precise timestamp flashes from the camera LED for astronomical videos (primarily asteroidal occultation recordings). Just point the camera flash into the optical path of the video recording device and trigger the desired flash mode. Four separate flash modes offer flexibility for time stamping video captures. • Flash Single - flashes the camera LED once at the start of the next UTC second. Duration of the flash can be set by the user. • Flash Bracket - flashes the camera LED twice, separated by a user specified duration, to bracket the event. • Flash Series - produces a series of camera LED flashes with user specified flash duration, number of flashes and time interval between flashes. • Flash PPS - produces a sequence of "Pulse Per Second" camera LED flashes. Each flash starts at the next UTC second. A Delay option can delay the start of any flash mode until a user specified time or for a user specified duration. A pre-flash feature is optional to initialize the camera's flash system and reduce the delay between scheduled flash time and actual flash time. The flash time is logged in local time and UTC, along with local date, latitude, longitude, elevation and flash number. An event title and a comment are also logged with each flash. Optionally, device system information can be logged. The resulting log can be shared by email, messaging, copying to Notes and more. Preferences provide a switch to turn the Pre-Flash feature on and off, an LED intensity control and a flash offset adjustment field, as well as a switch for device system information logging. ## Key features - Precise camera LED flash timestamping - Multiple flash modes (Single, Bracket, Series, PPS) - Customizable flash duration and intervals - Optional delay and pre-flash features - Logs local time, UTC, location, and event details - Shareable log data via email and messaging ## Frequently asked questions about AstroFlashTimer ### What is AstroFlashTimer used for? AstroFlashTimer is designed to provide precise timestamp flashes from your device's camera LED specifically for astronomical video recordings, such as those capturing asteroidal occultations. It helps accurately mark the timing of celestial events within your videos. ### What are the different flash modes in AstroFlashTimer? AstroFlashTimer offers four distinct flash modes: Flash Single for a single flash at the start of a UTC second, Flash Bracket for two flashes separated by a user-defined duration, Flash Series for a customizable sequence of flashes, and Flash PPS for pulse-per-second flashes. ### Can AstroFlashTimer delay its flashes? Yes, AstroFlashTimer includes a Delay option that allows you to postpone the start of any flash mode until a specific UTC time or for a user-defined duration. This provides extra control over when the timestamp flash occurs. ### What information is logged by AstroFlashTimer? Each flash logged by AstroFlashTimer includes the local time and UTC, local date, latitude, longitude, elevation, and the flash number. You can also add an event title and comment, and optionally log device system information. ### How can I share the data logged by AstroFlashTimer? The log generated by AstroFlashTimer can be easily shared through various methods, including email, messaging apps, copying to your device's Notes application, and more. This makes it convenient to distribute your recorded event data. ### Does AstroFlashTimer have ads? The provided data does not indicate the presence of advertisements within AstroFlashTimer. It is listed as a free application without any mention of ad support. ### What devices is AstroFlashTimer compatible with? AstroFlashTimer is available for iPhone, iPad, and iPod devices. It is designed to run on Apple's mobile operating system. ### How often is AstroFlashTimer updated? The latest version of AstroFlashTimer, 1.1.1, was released on June 13, 2022. While the update frequency isn't explicitly stated, this indicates it has received updates since its initial release in 2018. ## Version history (last 1 release) ### 1.1.1 — 2022-06-13 • Minor updates to conform with Apple's App Store improvements. ## Apps similar to AstroFlashTimer | App | Rating | Price | Category | | --- | --- | --- | --- | | [Teremok-ASL](https://appshunter.io/ios/app/teremok-asl/id1310794904) | 5.0 (2) | Free | Education | | [VideoStack for Planet](https://appshunter.io/ios/app/videostack-for-planet/id1645890568) | 3.2 (6) | Free | Education | | [Spinne](https://appshunter.io/ios/app/spinne/id1567764012) | — | Free | Education | | [Learn Vietnamese - Beginner 3](https://appshunter.io/ios/app/learn-vietnamese-beginner-3/id6450500081) | 4.3 (4) | Free | Education | | [Learn Vietnamese - Beginner 2](https://appshunter.io/ios/app/learn-vietnamese-beginner-2/id6450500051) | 4.6 (9) | Free | Education | | [The Giant Turnip-ASL](https://appshunter.io/ios/app/the-giant-turnip-asl/id1170655232) | 5.0 (2) | Free | Education | ## More apps by John Grismore - [OW_Mobile](https://appshunter.io/ios/app/ow-mobile/id1490726741) All apps by John Grismore: https://appshunter.io/developer/948492187 --- *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 2026-06-25.*