# Silverlog Stars — Astrophotography Exposure Calc

> Astrophotography Exposure Calc (iPhone/iPad app by Simon Westgate.)

- Source: https://appshunter.io/ios/app/silverlog-stars/id6759198249 (this page in markdown: same URL + `.md`)
- Developer: [Simon Westgate](https://appshunter.io/developer/1856537803)
- Category: Photo & Video, Utilities
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 15.1 · 27 MB
- Languages: American English
- Released: 2026-03-23
- Data updated: 2026-05-10
- User reviews in markdown: https://appshunter.io/ios/app/silverlog-stars/id6759198249/reviews.md

## What is Silverlog Stars?

Silverlog Stars calculates the maximum exposure time for sharp, pinpoint stars — helping you avoid unwanted star trails in astrophotography.

HOW IT WORKS
Enter your focal length and sensor/film format. The calculator shows your maximum shutter speed using multiple established rules (500 Rule, NPF Rule) so stars remain points of light rather than streaks.

FEATURES
• 500 Rule calculation
• NPF Rule calculation (more accurate for modern sensors)
• Multiple sensor and film format support
• Adjustable pixel pitch for precise NPF results
• Star trail mode — calculate exposure for intentional trails
• Works offline — no internet connection needed
• Clean, focused interface
• Dark mode support

USEFUL FOR
• Milky Way photography
• Nightscape and starscape shooting
• Choosing the right focal length for astrophotography
• Understanding the relationship between focal length and star movement
• Planning intentional star trail exposures

Part of the Silverlog photography toolkit. No account required. No data collected.

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Legend | $2.99 | one-time |
| Nice One | $0.99 | one-time |
| Absolute Hero | $4.99 | one-time |
| Guardian Angel | $9.99 | one-time |
| Actual Saint | $29.99 | one-time |



## Version history (last 1 release)

### 1.0 — 2026-03-23

No release notes.

## More apps by Simon Westgate

- [Silverlog](https://appshunter.io/ios/app/silverlog/id6755815649)
- [Silverlog Reciprocity](https://appshunter.io/ios/app/silverlog-reciprocity/id6756740671)
- [Silverlog Mix](https://appshunter.io/ios/app/silverlog-mix/id6756785829)
- [Silverlog DoF](https://appshunter.io/ios/app/silverlog-dof/id6756788185)
- [Silverlog Hyperfocal](https://appshunter.io/ios/app/silverlog-hyperfocal/id6756801107)
- [Silverlog Flash](https://appshunter.io/ios/app/silverlog-flash/id6757318928)

All apps by Simon Westgate: https://appshunter.io/developer/1856537803

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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 2026-05-10.*