ASKAR Colour Magic Duo-band C1 Filter in 2" (Ha-OIII/15nm-35nm)

ASKAR Colour Magic Duo-band C1 filter in 2" (Ha-OIII/15nm-35nm)

We call "C1" the Hα+OⅢ dual-band filter and "C2" the SⅡ+OⅢ dual-band filter, so their combination is the Colour Magic C 2" dual-band filter package. It allows color camera users to shoot without mono camera and narrow band H/S/O filter, providing more fun of astrophotography.

Only the C1 filter is supplied under this part number.

With efficient and excellent image performance and a fun and innovative shooting experience, let the Colour Magic C duo-band filters become your great tool for capturing the beautiful moments of the universe!

Premium construction

Askar has designed these dual band filters with quality in mind. Both filters are 2 ± 0.05 mm thick and offer high performance with their nominal 90% transmission within their respective wavelengths. Enjoy crystal clear images thanks to the impressive 60/40 surface finish as well as the barrier property of OD3 at 200-1000 nm.

Colour Magic C Duo-band filters have a high transmittance of more than 90% at the central wavelengths:

C1 (Hα+OIII): 500.7 nm and 656.6 nm

Color Magic C Duo-band filters can effectively improve image quality by darkening the celestial background of the image and maximizing contrast throughout the image, enhancing the contrast of your photographs and making it easier to see star details. In areas with very severe light pollution, these filters can also selectively filter out light pollution and cluttered signals through the nebula's emission lights to achieve the ideal shooting effect.

These filters have a wider passband and are a more economical alternative to the "D" filter set from Askar.

The Colour Magic C1 Duo-band (Hα+OIII) filter has a high transmittance of over 90% at its center wavelength (500.7nm and 656.6nm). It can effectively enhance image quality by making the celestial background of the image darker while maximizing contrast throughout the image， improving the contrast of your photographs and making it easier to see star details.

In areas with very severe light pollution, this filter can also selectively filter out light pollution and cluttered signals through nebula emission lights to achieve the ideal shooting effect.

TECHNICAL SPECIFICATIONS:

CWL:

• Ha & OIII: 500.7nm & 656.6nm
• Ha：15nm±3nm (FWHM)
• OIII：35nm±5nm (FWHM)
• Maximum transmittance: 90%.
• Thickness: 2 ± 0.05mm
• Barrier property: ≥OD3 @ 200-1000nm
• Surface finish: 60/40

Emission nebulae imaging

Emission nebulae are celestial bodies that emit a certain wavelength of light, typically in the Ha, SII and OIII bandpasses. This filter Askar Colour Magic C1 has a peak transmittance of 90% at 500.7nm (OIII) and 656.6nm (Ha), while the C2 filter has a peak transmittance of 90% at 500.7nm (OIII) and 672nm (SII). Isolation of these wavelengths reveals intricate details within the nebulosity discerning them from the light-polluted background sky. In post-processing, mapping SII to red, Ha to green and OIII to blue results in the popular Hubble (SHO) palette.

ASKAR Colour Magic Duo-band C1 filter in 2" (Ha-OIII/15nm-35nm)