Filtre Chroma SII 3nm Ultra – 2″ Monté

CHF 1'299

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Filtre SII 3nm de Chroma Technology

Visit filtre SII 3nm de Chroma Technology est un filtre à bande ultra-étroite conçu pour isoler la raie d’émission du soufre ionisé (SII) à 672 nm. Ce filtre est particulièrement adapté à l’imagerie des nébuleuses où le soufre joue un rôle clé dans l’émission spectrale. Il est idéal pour les astrophotographes recherchant un contraste maximal et une séparation claire des différentes raies spectrales.

Key features

  • Bandwidth : 3 nm, permettant une isolation extrêmement précise de la raie SII, tout en bloquant efficacement les longueurs d’onde indésirables (pollution lumineuse, H-alpha, etc.).
  • Targeted emission rays : SII doublet at 671.6 nm and 673.1 nm, characteristic of sulfur-rich nebulae.
  • High transmission : Up to 90 % at 672 nm, guaranteeing an excellent signal-to-noise ratio.
  • Optical quality : Surface polished to an accuracy of λ/4.
  • Multi-layer anti-reflective coatings : On both sides to minimize halos and stray reflections.
  • Substrate thickness : Environ 3 mm ± 0,05 mm, fabriqué à partir d’un substrat unique de verre optique pour une durabilité exceptionnelle.
  • Parallelism : <30 arcsec, garantissant une qualité d’image optimale.

Applications

  • Imaging SII-rich nebulae:
    • Parfait pour capturer des objets comme la nébuleuse du Crabe, la nébuleuse de la Rosette ou la nébuleuse du Voile.
  • Reducing light pollution :
    • Bloque efficacement les longueurs d’onde indésirables, même dans des environnements urbains ou suburbains.
  • Advanced astrophotography :
    • Ideal complement to H-alpha and OIII filters for creating images in scientific palettes (SHO or Hubble palette).
  • Compatibility with high-speed systems :
    • Works perfectly with focal ratios up to f/4.0.
    • Une version optimisée est disponible pour les systèmes très rapides (f/2.8 à f/3.6), afin de compenser le décalage spectral vers le bleu (blueshift).

Technical highlights

  • Exceptional durability :
    • Sputter coatings guarantee long-term spectral stability.
    • Resistant to extreme variations in temperature and humidity.
  • Anti-halos design : Anti-reflective coatings eliminate halos around bright stars, delivering sharp, detailed images.
  • Universal compatibility : Compatible with most filter wheels and drawers on the market.

Available formats

  • Mounted : 1,25", 2"
  • Unmounted : Customized formats (31 mm, 36 mm).

Conclusion

The filter Chroma SII 3nm est un outil essentiel pour les astrophotographes cherchant à capturer les détails subtils des nébuleuses riches en soufre ionisé. Sa précision optique, sa transmission élevée et sa capacité à réduire efficacement la pollution lumineuse en font un choix incontournable pour l’imagerie du ciel profond.

Filter typeSHO (narrow bands)
Bandwidth3 nm
ParafocusingData currently being integrated, estimated availability shortly
WavelengthData currently being integrated, estimated availability shortly
WeightData currently being integrated, estimated availability shortly
In the boxData currently being integrated, estimated availability shortly
Special featuresData currently being integrated, estimated availability shortly

Why choose Deep Space Astronomy?

Because astronomy is our passion! Our team of experts is here to guide you in your choice of equipment, from beginner telescopes to the most sophisticated astrophotography equipment.

  • Personalized advice: Take advantage of our expertise to choose the ideal instrument for your needs and budget.
  • A wide choice of products: We offer a rigorous selection of quality equipment from the leading brands on the market.
  • Customized training: Expand your knowledge of astronomy with our online and face-to-face training courses.
  • Responsive after-sales service: We're here to help you make the most of your experience.

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