# Astro Calc — Avoid unwanted star trails

> Avoid unwanted star trails (iPhone/iPad app by Ben Brackenbury.)

- Source: https://appshunter.io/ios/app/astro-calc/id1519116307 (this page in markdown: same URL + `.md`)
- Developer: [Ben Brackenbury](https://appshunter.io/developer/1518789219)
- Category: Photo & Video, Utilities
- Price: Free
- Age rating: 4+
- Requires: iOS 13.5 · 1 MB
- Languages: American English
- Released: 2020-06-18
- Data updated: 2026-06-10
- User reviews in markdown: https://appshunter.io/ios/app/astro-calc/id1519116307/reviews.md

## What is Astro Calc?

To avoid unwanted star trails when taking pictures of the night sky, a maximum shutter speed exists, influenced by focal length and sensor crop factor. Astro Calc calculates this for you.


## Version history (last 2 releases)

### 1.0.1 — 2020-06-21

Select lower focal lengths, all the way down to 1mm.

### 1.0 — 2020-06-18

No release notes.

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## More apps by Ben Brackenbury

- [Redstone](https://appshunter.io/ios/app/redstone/id6755842069)

All apps by Ben Brackenbury: https://appshunter.io/developer/1518789219

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*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 2026-06-10.*