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Askar ColorMagic Duo-Band Narrowband Imaging Filter

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Askar ColorMagic Duo-Band Narrowband Imaging Filter

The Askar Duo-band narrowband, as its name suggests, has two passbands, which is quite different from those single-band narrowband filters thus more economical and efficient because astrophotographers don't need to purchase a filter wheel or a whole narrowband filter set. And imagers don't have to buy a monochrome astronomy camera as the duo-band narrowband filter goes well with ordinary colour cameras. So the duo-band filter is an economical admission ticket for astrophotography lovers into the world of narrowband technology and deep-sky object imaging.

The Askar duo-band filter is suitable for imaging emission nebulae, planetary nebulae and supernova remnants. The Askar duo-band filter has an extreme high transmission at a centre wavelength of 500.7nm (O III) and 656nm (H-alpha). Narrow bandwidth enables this astroimaging filter to block all the light pollution and other unwanted artificial lights or night glow. So the Askar duo-band filter is an ideal instrument for astro-imaging in heavily light-pollution hit locations and delivers enhanced contrast at darker places.

The Askar duo-band filter is designed for improving the contrast and details of nebulae and supernova remnants. Featuring narrow bandwidth and a greatly high transmission at a centre wavelength of 500.7nm and 656nm, the Askar duo-band filter can bring out the highest amount of details of the emission nebulae, planetary nebulae and supernova remnants. Also, the out-of-band blocking ability is rated with OD3 (0.1%) with the blocking range of 200-1100nm. It delivers an excellent signal-to-noise ratio and a sharp cut-off rate to attenuate the disturbance from other wavelengths.

The narrow bandwidth and an effective cut-off rate are important features when choosing a narrowband filter. The Askar duo-band filter has a narrow bandwidth and an extreme transmission of over 90% at 500.7nm and over 80% at 656nm, whilst sufficiently suppressing other off-band wavelengths. So the Askar Duo-Band filter can efficiently reject all the light pollution. You can expect a terrific performance of this duo-band filter in artificially-brighten background sky with your astronomy cameras (like the ZWO ASI series colour cameras).

The production process is strictly controlled and every single Askar duo-band narrowband filter is individually examined and tested to ensure that they can highly satisfy the observing interests and needs of our customers.


  • Narrow bandwidth, properly designed for astrophotography both in light polluted or dark locations.
  • Useful for imaging emission nebulae, planetary nebulae and supernova remnants.
  • High transmission and sharp cut-off can greatly enhance the contrast and bring out the most detailed information for those deep-sky objects.
  • Designed to sharply cut off the inference of artificial light from sodium vapor or mercury vapor street lights and other unwanted disturbance like sky glow.
  • The Askar duo-band narrowband filter is not suitable for visual observation and not designed for imaging or observing the Sun.


Images are for demonstration purposes only. Might show a similar product or the same product, but different size.

Askar ColorMagic Duo-Band Narrowband Imaging Filter Bandwidht


Specifications: Askar ColorMagic Duo-Band Narrowband Imaging Filter

What's in the Box

What's in the Box: Askar ColorMagic Duo-Band Narrowband Imaging Filter

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