Antlia 3.0nm Pro Filters (H-alpha, SII, OIII)

Overview

Antlia 3.0nm Pro Filters are a premium solution for astrophotography, designed to achieve ultra-high contrast by isolating narrowband emissions. With a guaranteed transmission rate of over 90% (T>90%) within a precise 3.0nm bandwidth, Antlia 3.0nm Pro Filters excel in suppressing light pollution and achieving maximum contrast for both faint and bright targets. Engineered for systems as fast as f/3, Antlia 3.0nm Pro Filters ensure minimal signal loss, making them ideal for high-performance optical setups.

Applications and Performance

• Antlia 3.0nm Pro Filters offer exceptional transmittance and a narrow band-pass to enhance contrast in astrophotography.
• The ultra-steep spectral profile of Antlia 3.0nm Pro Filters minimises halos, ensuring clean and detailed imaging around bright stars.
• Manufactured with optical-grade single substrates, Antlia 3.0nm Pro Filters eliminate internal reflections for optimal reliability.
• Perfect for capturing H-alpha, SII, and OIII emissions in deep-sky objects, including emission nebulae, planetary nebulae, and supernova remnants.
• Antlia 3.0nm Pro Filters are effective in both light-polluted skies and dark-sky locations, ensuring flexibility in imaging conditions.
• Designed to extend imaging time, Antlia 3.0nm Pro Filters allow for successful imaging even under moonlit skies.
• Optimised for systems with focal ratios as fast as f/3, these filters minimise emission signal loss while maximising imaging potential.

Note: Antlia 3.0nm Pro Filters are specifically tailored for astrophotography and are ideal for capturing H-alpha, SII, or OIII wavelengths.

Technical Specifications

• Substrate: Optical-grade, single/non-glued substrate.
• Filter Thickness:
  • 2mm ± 0.05mm for 1.25”, 2” mounted, Dia31mm, and Dia36mm unmounted filters.
  • 3mm ± 0.05mm for Dia50mm unmounted filters.
• FWHM (Full Width at Half Maximum): 3.0nm.
• CWL (Central Wavelength):
  • H-alpha: 656.3nm.
  • SII: 672.4nm.
  • OIII: 500.7nm.
• Peak Transmission: >90%.
• Blocking: > 5 OD (out-of-band blocking) @ 300–1000nm.
• Surface Quality: S/D (scratch/dig) = 60/40 (per MIL-O-13830 standards).
• Transmitted Wavefront: Lambda/4 or better.
• Parallelism: Less than 30 arcsec.

Filter Cell

• Sizes:
  • Mounted: 1.25” (M28.5x0.6), 2” (M48x0.75).
  • Unmounted: Dia31mm, Dia36mm, Dia50mm.
• Ultra-thin filter cell to minimise vignetting.
• Black anodised finish with non-fading laser engraving.

Important Notes

• Not recommended for solar observing or visual observation.
• Warranty: 3 years against delamination.
• Warning: Do not look at the Sun with Antlia 3.0nm Pro Filters. Serious eye damage will result.

Manufacturer's Note

Antlia 3.0nm Pro Filters are designed with advanced optical precision to meet the demands of professional astrophotographers. Each filter undergoes rigorous quality testing to ensure high transmittance, precise band-pass parameters, and exceptional optical reliability. While minor halos around bright stars are rare, they may occur depending on the optical setup. Although premium filters like Astrodon or Chroma can guarantee halo-free imaging, Antlia 3.0nm Pro Filters strike a balance between performance and affordability, offering outstanding value for most users.

Return Policy: Returns are not accepted for halo-related issues.