The Antlia Red+ 2" is a long-red enhancement filter from the LRGBR+ Dark series, covering the extended 700–1000 nm band. Designed for deep-sky astrophotography, it enhances the red channel by capturing near-infrared structures and improving detail and color separation in emission regions with complex spectral composition.

Key features

• extended long-red passband from 700–1000 nm for enhanced near-infrared sensitivity
• high peak transmission of approximately 95%
• quartz-glass substrate with extremely low thermal expansion
• off-band blocking of ≥OD4.5 (0.005%) up to 1000 nm
• double-sided fine polishing ensuring parfocality with LRGB and SHO filters
• advanced edge-to-edge coatings for maximum spectral uniformity
• 2" black anodized filter cell with M48×0.75 thread and laser-engraved markings
• compatible and parfocal with Antlia SHO 2.5 nm filters due to matching substrate type
• intended for astrophotography; not recommended for visual observing

Included items

• Antlia Red+ LRGBR+ Dark series 2" filter in M48×0.75 threaded cell

Technical specifications

• filter type: Red+ (extended long-red band)
• diameter: 2" (mounted)
• thread: M48×0.75
• transmission range: 700–1000 nm
• peak transmission: approx. 95%
• off-band blocking: ≥OD4.5 across 300–1000 nm
• substrate: quartz glass
• filter thickness (mounted 2"): 2.0 mm ±0.05 mm
• optical finish: double-sided polishing, edge-applied coatings
• not recommended uses: solar observing, visual observing

Warning: NEVER look at the Sun with the Antlia Red+ 2" filter. Ignoring this warning can cause permanent eye damage.