Chroma OIII filter 3nm ( 2.8 < f/d < 3.6) - 2" Mounted

Chroma OIII 3nm filter

Visit Chroma OIII 3nm filter optimized for fast focal ratios between f/2.8 and f/3.6 is a precision tool designed for narrow-band astronomical imaging. This filter isolates the emission line of doubly ionized oxygen (OIII) at 500.7 nm, essential for capturing the details of planetary nebulae, supernova remnants and HII regions.

Key features

• Ultra-narrow bandwidth of 3 nmOIII: Allows precise isolation of the OIII line at 500.7 nm, while effectively blocking unwanted wavelengths such as those from light pollution or natural night-time emissions.
• Optimized for high-speed systems (f/2.8 to f/3.6)Designed to compensate for the blueshift that occurs with high-speed optics.
• Exceptional transmissionTransmission of up to 90 % at 500.7 nm, for optimum signal-to-noise ratio and detailed images.
• Robust constructionMultilayer sputter coatings for exceptional durability and long-term spectral stability.
• High-quality optical glass substrateSurface accuracy of λ/4, reducing optical aberrations.

Applications

• Imaging ionized oxygen-rich nebulaeIdeal for capturing the complex structures of planetary nebulae and supernova remnants (e.g. the Veil Nebula).
• Essential complement to H-alpha and SII filtersTo create SHO (Hubble) palette images.
• Reducing light pollutionBlocks wavelengths from sodium and mercury lamps, as well as atmospheric luminescence.
• Advanced astrophotography with high-speed systemsCompatible with modern CCD and CMOS cameras, optimizing performance on fast telescopes such as HyperStar or RASA systems.

Technical advantages

• Universal compatibilityAvailable in mounted (1.25", 2") and unmounted (31 mm, 36 mm) formats, to suit a wide range of filter wheels and optical configurations.
• Anti-glare designAnti-reflective coatings on both sides to eliminate halos around bright stars.
• Guaranteed spectral accuracy: Each filter is individually tested to ensure performance to exacting specifications.

Conclusion

Visit Chroma OIII 3nm filter optimized for f/2.8 to f/3.6 is an essential tool for astrophotographers using fast optical systems. Its ultra-narrow bandwidth, exceptional transmission and blueshift optimization guarantee images rich in detail and unrivalled contrast, even under polluted skies.