Chroma H-Alpha 3nm filter
Visit Chroma H-Alpha 3nm filter optimized for fast focal ratios between f/2.8 and f/3.6, is specially designed for narrow-band astronomical imaging. This high-precision filter captures the emission line of ionized hydrogen at 656.3 nm, a wavelength crucial for revealing the details of hydrogen-rich nebulae.
Key features
- Ultra-narrow bandwidth of 3 nmH-alpha: effectively isolates the H-alpha line while blocking unwanted wavelengths such as light pollution and natural night emissions.
- Ideal for capturing fine detailsPerfect for celestial objects such as the Orion Nebula, the Rosetta Nebula or the Swan Complex.
- Optimized for high-speed systems (f/2.8 to f/3.6)Designed to compensate for the blueshift that occurs with high-speed optical systems.
- Exceptional transmissionTransmittance of up to 99 % at the center wavelength, guaranteeing optimum light collection while maximizing contrast.
- Sustainable constructionMultilayer sputter coatings for enhanced resistance to temperature and humidity variations. Unique high-quality glass substrate, eliminating the need for lamination and improving spectral stability.
Applications
- Imaging hydrogen-rich nebulaeDetailed capture of complex structures in HII regions. Ideal for narrow-band astrophotography projects, including SHO palettes (Hubble).
- Reducing light pollution: Effectively blocks unwanted wavelengths (sodium lamps, mercury or lunar emissions), even under polluted skies.
- Use with modern CCD/CMOS camerasCompatible with high-resolution sensors and fast optical systems to maximize deep-sky performance.
Technical advantages
- Universal compatibility: Works with most filter wheels and drawers available on the market.
- Available in mounted (1.25”, 2”) and unmounted formats: To adapt to specific needs.
- Anti-glare designAnti-reflective coatings on the rear surface to eliminate halos or ghosting around bright stars.
- Specially designed for high-speed systemsMaintains optimum spectral precision despite the blueshift inherent in high-speed optics.
Conclusion
Visit Chroma H-Alpha 3nm filter optimized for f/2.8 to f/3.6 is an indispensable tool for astrophotographers using fast optical systems. Its ultra-narrow bandwidth, exceptional transmission and robust design guarantee images rich in detail and unrivalled contrast, even under polluted skies.
