https://github.com/itwars/astro-exposure-time
Compute exposure time (NPF,NPF full, 4Crop, Rule500) for astrophotography
https://github.com/itwars/astro-exposure-time
4crop astrophotography npf rule500
Last synced: about 1 year ago
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Compute exposure time (NPF,NPF full, 4Crop, Rule500) for astrophotography
- Host: GitHub
- URL: https://github.com/itwars/astro-exposure-time
- Owner: itwars
- Created: 2022-08-11T09:58:18.000Z (almost 4 years ago)
- Default Branch: main
- Last Pushed: 2022-08-11T12:40:55.000Z (almost 4 years ago)
- Last Synced: 2025-01-21T03:25:04.423Z (over 1 year ago)
- Topics: 4crop, astrophotography, npf, rule500
- Language: Go
- Homepage:
- Size: 18.6 KB
- Stars: 0
- Watchers: 2
- Forks: 0
- Open Issues: 0
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Metadata Files:
- Readme: README.md
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README
# Astrophotography exposure time
This piece of code compute exposure time according 4 differents methodes :
- NPF: (35 x Aperture +30 x Pixel Pitch) / Focal Length
- NPF full: Accuracy x (16.9 x Aperture + 0.10 x Focal Length + 13.7 x Pixel Pitch) / (Focal Length x cos(declinaison))
- 4Crop: 100 x (4−crop) / Focal Length
- Rule500: 500 / Crop-Factor x Focal Length
> Best accuracy of exposure time is given by NPF full rule
For details please see:
- [The 500 Rule](https://astrobackyard.com/the-500-rule/)
- [Règle NPF – calcul du temps de pose sans filé d’étoiles](https://sahavre.fr/wp/regle-npf-rule/)
# Setup and running
- Add your own technical specification in config.yml file (some technical parameters can be find on [Digital Camera Database](https://www.digicamdb.com/)
- go run main.go
- As a result :
```
NPF Simple : temps de pause de 50.6 sec.
NPF Complet : temps de pause de 23.6 sec.
4 Crops : temps de pause de 46.7 sec.
Règle des 500 : temps de pause de 60.5 sec.
```
## Help needed
Is there a way to calculate *Pixel Pitch* and *Crop Factor*?