Antlia Quad Band Anti-Light Pollution Filter

Antlia Quad Band Anti-Light Pollution filter

The Antlia Quad Band Anti-Light Pollution filter is designed to effectively reduce light pollution while capturing a wide range of deep-sky objects, including galaxies, reflection nebulae, emission nebulae and star clusters. It works with both color (OSC) and monochrome cameras, and is compatible with high-speed optics up to f/2.

Key features

• Targeted elimination of polluting lights (high-pressure sodium and blue LEDs)
• Capture over 95% of deep-sky objects
• Simultaneous transmission of Ha, SII, OIII, H-Beta and NII lines
• High transmission (>92%) at all major emission wavelengths
• Near infrared (NIR) transmission to detect signals inaccessible to other filters
• Compatible with ultra-fast lenses up to f/2 without significant loss of performance
• Natural color balance for easy post-processing
• One-piece, unglued optical substrate
• Optical surface quality S/D 60/40 (MIL-O-13830)
• Transmitted wavefront: λ/4 or better
• Parallelism: less than 30 arcsec

Spectral Specifications

• H-alpha: 656.3nm (>92%)
• SII: 671.6nm and 673.1nm (>92%)
• OIII: 495.9nm and 500.7nm (>92%)
• H-Beta: 486.1nm (>92%)
• NII: 654.8nm and 658.3nm (92%)
• Out-of-band blocking: ≥OD4 from 300 to 1050nm
• Filter thickness: 2mm ± 0.05mm

Filter design

• Ultra-thin cell for reduced vignetting
• Standard Antlia ring: 1.25″ (M28.5×0.6) and 2″ (M48x0.75)
• Durable black anodized finish
• Resistant laser engraving (non-fading)

Ideal applications

• Astrophotography of galaxies, emission and reflection nebulae, star clusters
• Use from heavily polluted skies (Bortle 8) to clean skies (Bortle 1)
• Optimized for cameras with AR glass, to capture both visible and near-IR images

Recommended use

• Compatible with OSC color and monochrome cameras
• Ideal for cameras without internal UV/IR cut (AR glass)

Not recommended

• Solar imaging
• Visual observation at night

Safety warnings

• DO NOT use to observe the Sun directly.
• Serious eye damage may result from improper use.