Anti-Halo PRO Dual-Band 2″ Ha+OIII Filter

Description:

The Anti-Halo PRO Dual-Band 2″ Ha+OIII Filter is designed to address the issue of halos around stars when capturing famous deep sky objects. It offers a frame thickness of 5mm for the body and 2.5mm for the thread, making a total of 7.5mm. The filter glass has a thickness of 1.85mm.

Specifications:

Ha CWL: 656.3nm

Ha Band Width: 3.7±0.5nm

OIII CWL: 500.7nm

OIII Band Width: 3.2±0.5nm

Transmittance: >=85%

Blocking Depth: OD5 (200-1100nm)

Experience improved halo control with this advanced dual-band filter. Capture stunning deep sky objects without the interference of halos. See the results for yourself through Vega testing, where no halos were observed around the star.

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

Frame thickness: body 5mm+ thread 2.5mm, a total of 7.5mm

Filter glass: 1.85mm

Ha CWL: 656.3nm Band Width: 3.7±0.5nm

OIII CWL: 500.7nm Band Width: 3.2±0.5nm

Transmittance: >=85%

Blocking depth: OD5 (200-1100nm)

In recent years, not only the single narrowband filters are chasing narrower band width, but also the dual band filters. From 7nm to 3nm, from a manufacturing process improving so fast!

But one thing is missing, halo control! The halo around stars is a nightmare when you shoot some famous deepsky object!

Vega testing of halo control

Luke use his 8″ F4 Newtonian and Canon 700D to test Anti-Halo Pro dual-band filter, the target is Vega (Zero magnitude star), exposure 120sec. We can see there is no halo around Vega, the off axis big halo is the reflection of the lens in coma corrector.