The Player One Anti-Halo PRO Dual-Band 2″ Ha+OIII filter is a precision narrowband solution for OSC astrophotography, engineered to isolate Hα and OIII emissions while minimizing star halos. It delivers astronomically accurate contrast and darker backgrounds even in challenging imaging environments.

Key Features

• Hα: CWL 656.3 nm, Bandwidth 3.7 ± 0.5 nm
• OIII: CWL 500.7 nm, Bandwidth 3.2 ± 0.5 nm
• High transmission: ≥ 85% at both wavelengths
• Blocking depth: OD 5 across 200-1100 nm
• Frame thickness ~7.5 mm (body 5 mm + thread 2.5 mm); glass thickness 1.85 mm
• Advanced multi-layer coating suppresses halos, even around Vega-brightness stars