The ZWO Duo-Band Filter serves as a dual narrowband filter designed to enhance the capabilities of our ASI color camera lineup. This filter is perfect for astronomers who already own a One Shot Color (OSC) camera and are interested in diving into narrowband imaging or capturing emission objects, without the need for a monochrome camera, filter wheel, and a set of narrowband filters.

Not only does the Duo-Band filter offer a cost-effective gateway into the realm of narrowband imaging, but it also provides a practical solution for those dealing with light pollution in urban settings.

With its dual band-pass feature, the filter allows light at Hα (656.3nm) and OIII (500.7nm) wavelengths to pass through. This effectively minimizes interference from natural light sources like the moon or artificial ones like streetlights.

For those keen on capturing deep sky objects such as emission nebulae using an OSC camera, this filter can significantly enhance contrast and visibility.

If you're seeking a solution for deep-sky photography in areas affected by light pollution, the ZWO Duo-Band Filter is an excellent choice.

Compatible with all ASI cameras and the EFW Electronic Filter Wheel, the Duo-Band filter is available in both 1.25” and 2” sizes.

Specifications

Glass thickness: 1.85 mm

Bandwidth: HA (15nm) OIII (35nm)

Surface quality: 60/40 (Refer to MIL-O-13830)

Schott substrate material

More than 90% transmission at major OIII line 495.9nm and 500.7nm.

More than 80% transmission at Ha line 656.3nm

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ZWO 2" Duo-Band filter

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