Set of Antlia ALP-T Dualband 3.5 nm SII&H-beta and 3 nm Ha&OIII filters (2″)

Antlia ALP-T Dualband 3nm Ha&OIII and 3.5nm SII&Hβ filter kit

This kit combines two high-performance ultra-narrow filters to capture all the main deep-sky emission lines: H-alpha, OIII, SII and H-beta. Designed to maximize image quality with color cameras (OSC) while remaining perfectly compatible with monochrome sensors, these filters deliver exceptional contrast and minimal noise, even under polluted skies or in the presence of moonlight.

Antlia ALP-T Dualband 3nm Ha&OIII filter

• Simultaneous transmission of H-alpha (656.3nm) and OIII (500.7nm) lines
• Ultra-narrow bandwidth of 3nm for each emission line
• OD4.5 suppression of interfering wavelengths between 300nm and 1100nm
• Optimized for OSC cameras, but also effective with monochrome sensors
• Designed for f/4 or slower lenses (prefer Highspeed version below f/4)
• Transmission: 90% (H-alpha), 82% (OIII)
• Anti-halation coating to prevent internal reflections
• NIR blocking up to 1100nm

Antlia ALP-T Dualband 3.5nm SII&Hβ filter

• Simultaneous transmission of SII (672.4nm) and H-beta (486.1nm) lines
• Narrow bandwidth of 3.5nm for each line
• OD4.5 suppression of interfering wavelengths from 300nm to 1100nm
• Optimized for OSC cameras and monochrome compatibility
• Designed for f/4 or slower lenses
• Transmission: 90% (SII), 85% (H-beta)
• Anti-reflective coating and effective NIR blocking

Advantages of the 3nm Ha&OIII + 3.5nm SII&Hβ combo

• Capture of all major deep sky lines: Ha, OIII, SII and Hβ
• Optimized signal-to-noise ratio (SNR) even under polluted skies or the moon
• Significant reduction in halos and internal reflections
• Maximum post-processing flexibility for SHO, HOO, HSHb compositions, etc.
• Ideal solution for obtaining monochrome quality results with color cameras

Common technical specifications

• Thickness: 2mm ± 0.05mm
• Optical surface: S/D 60/40 (MIL-O-13830)
• Transmitted wavefront: λ/4 or better
• Parallelism: <30 arcsec
• Mounting: 2″ (M48x0.75), ultra-thin to limit vignetting
• Black anodized finish with durable laser engraving

Technology and manufacturing

• Ion Gun Assisted Deposition coating for enhanced durability
• NIR suppression up to 1100nm
• Blackened edges to eliminate stray reflections
• Ultra-stable spectral profile for extreme humidity and temperature conditions

Recommended applications

• Photography of emission nebulae, planetary nebulae and supernova remnants
• Astrophotography with enhanced SHO palette
• Imaging projects under high light pollution
• Full moon photo sessions

Warnings

• Not for solar observation
• Not for night-time visual observation
• Never use for direct observation of the Sun: danger of serious eye damage.