H-Beta Antlia 3nm Pro - 2″ filter

Antlia H-Beta 3nm Pro filter

Interferential Filter for Astrophotography

The Antlia H-Beta 3nm Pro filter optimizes the width at half maximum (FWHM) to a bandwidth of 3nm. Thanks to this narrow bandwidth, the filter greatly improves the contrast of emission targets by reducing unwanted background noise. It achieves an impressive transmission of 88% at 486.1nm, guaranteeing a powerful signal and well-defined nebular structures.

Out-of-band blocking is rated OD5 (0.001%), ensuring an excellent signal-to-noise ratio (SNR) and effectively cutting interference from other wavelengths. Its clean spectral profile is designed to minimize halos around bright stars.

Antlia's Pro 3nm series

The series includes Ha, SII, OIII and H-Beta filters, which capture extremely narrow data on four channels, offering great flexibility of combination in post-processing to meet a variety of needs.

Key features and applications

• High transmission and minimal bandwidth for maximum contrast
• Steep spectral profile to limit halos around bright stars
• One-piece substrate to eliminate internal reflections
• Target: H-Beta emission nebulae
• Can be used in polluted areas or in dark skies
• Compatible up to f/3 with minimal signal loss
• Blackened edges on unmounted filters to eliminate glare
• High optical reliability reduces subsequent image processing
• Filter effective only for deep-sky objects containing H-Beta emissions

Technical specifications

Spectral curve

Filter ring

• 2'' format (M48x0.75)
• Ultra-thin cell to minimize vignetting and maximize usable aperture
• Black anodized finish
• Tamper-proof laser engraving

Not recommended for :

• Solar observation
• Visual observation at night

Warning:

NEVER LOOK DIRECTLY AT THE SUN WITH THIS FILTER. Serious eye damage may occur.

Dualband filters for OSC cameras

Antlia also offers dual-band filters for color cameras (OSC): the ALP-T Dualband Ha&OIII 3nm and the SII&Hb 3.5nm. Their synergy produces extremely detailed images on all four channels: Ha, OIII, SII and Hb. These spectra can be recombined in classic or creative color palettes: H-O-Hb, S-H-O, H-S-OHb, H-O-O, etc.