The Askar ColourMagic Ultra E Filter, as its name suggests, boasts "Ultra" halo control capabilities. With the ColourMagic Ultra E Filters, you can capture high-quality deep-sky images even in areas affected by urban light pollution, atmospheric airglow, or other light sources. The narrower bandwidth of both filters (one at 3nm & the other outside of 3nm) and high transmission significantly enhances image contrast, making it easier to reveal subtle details of celestial objects that are typically difficult to capture. In this package, you will receive both the 2" Hα+OIII Ultra duo-narrowband filter as well as the 2" Ultra Duo SII+OIII filter. The Hα+OIII filter is referred to as E1 and the SII+OII filter as E2. Together, they form the ColourMagic Ultra E Filter Set, offering color camera users a novel way to achieve results similar to those taken with monochrome cameras and triple narrowband filters— without the need for additional equipment. This opens up new possibilities for astrophotographers to enjoy even more astronomical wonders. With exceptional halo control and innovative imaging solutions, the ColourMagic Ultra E Filter helps you explore the deeper beauty of the Universe. ColourMagic E1 Ultra Duo-Band Filter Specifications FWHM: OIII = 4.0 +/- 0.3nm, Ha = 3.7nm+/- 0.3nm CWL: 500.7nm & 656.6nm Peak Transmittance: 85% Filter Thickness: 1.85 +/- 0.05mm Barrier Property: ≥OD5 @ 200-1000nm Surface Finish: 60/40 Parallelism: 30" ColourMagic E2 Ultra Duo-Band Filter Specifications FWHM: SII = 4.0 +/- 0.3nm, OIII = 3.7nm+/- 0.3nm CWL: 500.7nm & 672nm Peak Transmittance: 85% Filter Thickness: 1.85 +/- 0.05mm Barrier Property: ≥OD5 @ 200-1000nm Surface Finish: 60/40 Parallelism: 30"
