Anti-Halo PRO Dual-Band 2 inch Ha+OIII filter

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

Why Choose This Product?

• Superior halo suppression:
  Advanced coating eliminates reflection halos common with bright stars.
• Dual-band convenience:
  Combines Hα and OIII in one filter-ideal for OSC systems and deep-sky imaging.
• High signal efficiency:
  Transmission ≥ 85% ensures strong nebular capture even under light pollution.
• Low-profile design:
  7.5 mm total thickness fits smoothly into KF-MW and filter drawer systems.