Askar Colour Magic Ultra E2 3 nm Duo Narrowband Filter (OIII&SII), 2 Inch

Askar Colour Magic Ultra E2 3 nm Duo Narrowband Filter (OIII&SII), 2 Inch

The ColourMagic Ultra E 2" Duo-narrowband filter is a professional astrophotography tool specifically designed for deep-sky imaging. Except for the traditional H-alpha+OIII Duo-narrowband filter, Askar innovatively introduced another filter, now for [S II] + [O III]. The ColourMagic Ultra E2 filter is an SII+OIII filter.

The Ultra E2 filter has, as the name suggests, the "Ultra" halo control capability. During the filter research and development process, Askar made a special design optimization for Ultra E2. And in the end, it becomes a special filter with one bandwidth at 3.7 nm and the other bandwidth of 4.0 nm.

When shooting deep-sky galaxies with colour cameras, a duo-narrowband filter in the H-alpha and [O III] bands is often used; whereas with a mono camera, a narrowband filter in the H-alpha, [S II] and [O III] bands is often used, leaving users with colour cameras missing one band of nebula detail. This can be compensated by using ColourMagic Ultra E2 Duo-narrowband filter (OIII+SII) mentioned above.

The ColourMagic Ultra E2 Duo-narrowband filter (OIII+SII) has an ultra-high transmittance of over 85% at the center of its wavelength ranges (500.7 nm and 672 nm). It can effectively enhance the contrast of your pictures, making it easier to display the details of the stars that otherwise are fairly difficult to spot. In areas with very serious light pollution, this filter can also selectively filter light pollution and cluttered signals through the emission lights of the nebula to achieve the ideal shooting effect.

- Filter in transport packaging

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