The Antlia LRGB Dark series 50 mm is a complete set of four unmounted filters — Luminance, Red, Green and Blue — designed for high-performance deep-sky astrophotography. The LRGB Dark series provides excellent contrast and high signal-to-noise ratio, using quartz-glass substrates with extremely low thermal expansion to maintain stable star profiles under changing environmental conditions.

Key features

• complete set of four filters: Luminance (UV/IR Cut), Red, Green, Blue
• precisely defined spectral passbands:
  • L: 400–710 nm
  • R: 595–705 nm
  • G: 495–605 nm
  • B: 410–505 nm
• high peak transmission: L/R/G about 97%, B about 95%
• quartz-glass substrate with extremely low thermal expansion
• out-of-band blocking ≥OD4.5 (0.005%) across 300–1000 nm
• advanced edge-to-edge coatings for uniform optical performance
• double-sided fine polishing ensuring parfocality across the entire set
• highly scratch-resistant coatings suitable for safe cleaning
• fully blackened edges on all unmounted filters to reduce stray reflections
• parfocal and substrate-matched with Antlia SHO 2.5 nm filters
• intended for astrophotography; not recommended for visual observation

Included items

• Antlia Luminance LRGB Dark series 50 mm (unmounted, blackened edges)
• Antlia Red LRGB Dark series 50 mm (unmounted, blackened edges)
• Antlia Green LRGB Dark series 50 mm (unmounted, blackened edges)
• Antlia Blue LRGB Dark series 50 mm (unmounted, blackened edges)

Technical specifications

• type: LRGB filter set for astrophotography (L, R, G, B)
• diameter: 50 mm (unmounted)
• Luminance passband: 400–710 nm (UV/IR Cut)
• Red passband: 595–705 nm
• Green passband: 495–605 nm
• Blue passband: 410–505 nm
• peak transmission: L/R/G about 97%, B about 95%
• off-band blocking: ≥OD4.5 (0.005%)
• substrate: quartz glass
• filter thickness: 3.0 mm ±0.05 mm
• optical finish: double-sided fine polishing, edge-to-edge coatings
• edge treatment: blackened edges
• not recommended uses: solar observing, visual observing

Warning: NEVER look at the Sun with the Antlia LRGB Dark series 50 mm filter set. Ignoring this warning can cause permanent eye damage.