Antlia LRGB Dark Series filter

Antlia LRGB Dark Series filter kit

Antlia LRGB Dark Series 50mm unmounted filters are designed for full-spectrum astrophotography, covering the visible spectrum from 400 nm to 710 nm, with specific ranges for each channel. Made of quartz glass, these filters offer exceptional thermal and mechanical stability, ensuring long-lasting durability in extreme environmental conditions.

Kit contents

• Luminance filter (400-710nm, UV/IR Cut)
• Red filter (595-705nm)
• Green filter (495-605nm)
• Blue filter (410-505nm)

Key features

• Full visible-spectrum design for maximum sensitivity
• High transmission: L/R/G ≥97%, B ≥95%
• Out-of-band suppression ≥OD4.5 (0.005%) to block light interference
• Quartz glass for excellent thermal, mechanical and chemical resistance
• Minimizes star deformation induced by thermal variations
• Compatible and parfocal with Antlia's SHO 2.5 nm Ultra Narrowband filters
• Fine optical surface: S/D 60/40 with double-sided polishing
• Blackened edges and coatings extending to the very tip to reduce internal reflections
• Highly resistant to scratches and intensive cleaning

Performance and Applications

• Deep sky astrophotography: galaxies, nebulae, star clusters
• High-contrast, high-signal image capture even in difficult environments
• Ideal for modern monochrome CCD and CMOS configurations

Technical Specifications

• Thickness: 3mm ± 0.05mm
• Substrate: One-piece quartz glass
• Optical surface: S/D 60/40 (MIL-O-13830)
• Transmitted wavefront: λ/4 or better
• Parallelism: less than 30 arcsec
• Out-of-band blocking: ≥OD4.5 from 300nm to 1050nm

Price and availability

• Set LRGB Dark Series 50mm unmounted: 750 USD (4 filters)

Filter design

• Unmounted format 50mm
• High-resistance multilayer coating
• Double-sided anti-reflective treatment
• Blackened edges to eliminate stray reflections

Not recommended for

• Solar observation
• Visual observation at night

Safety warnings

• DO NOT use to observe the Sun directly. This would cause irreversible eye damage.

Warranty

• 3 years against delamination