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Colour Magic Ultra E1 Duo Narrowband Filter

Askar newly launched ColourMagic Ultra E1 2” Duo-narrowband Filter, is a professional astrophotography tool specifically designed for deep-sky imaging. The Ultra E1 filter, as the name suggests, has the "Ultra" halo control capability. During the filter research and development process, we made a special design optimization for Ultra E1. And in the end, it becomes a special filter with one bandwidth at 3nm and the other bandwidth outside 3nm.

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Product introduction

Askar Ultra E1 duo-band filter has an extremely narrow bandwidth, and an ultra-high transmittance over 85% at its center wavelength (500.7nm and 656.6nm). It can effectively eliminate the influence of light pollution. Even if you are in an area seriously affected by light pollution, the pictures taken with the ColourMagic Ultra E1 2” Duo-narrowband Filter are still very good. It is so practical and efficient that you can get astronomical images of high quality with just one duo-band filter and an ordinary astronomical colour camera.

The ColourMagic Ultra E1 2” Duo-narrowband Filter is ideal for photographing emission nebulae, planetary nebulae or supernova remnants. The highly narrow bandwidth of the filter effectively blocks out the effects of light pollution or other distracting factors such as night glow.

Specifications

ColourMagic Ultra E1 2” Duo-narrowband Filter（Hα+OIII）
FWHM	HA:3.7nm±0.5nm/OIII：4.1±0.5nm
CWL	500.7nm & 656.6nm
Peak transmittance	85%
Thickness	1.85 ± 0.05mm
Barrier property	≥OD5 @ 200-1100nm
Surface finish	60/40
Parallelism	30″