Askar E1 (Hα+OIII) 2-inch Ultra Duo-narrowband Filter Professional Astrophotography Tool for Deep-sky Imaging

Askar E1 (Hα+OIII) 2-inch Ultra Duo-narrowband Filter Professional Astrophotography Tool for Deep-sky Imaging

Description:
- 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 E 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 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.

Specification:
- FWHM: HA:3.7nm±0.3nm/OIII: 4.0±0.3nm
- CWL: 500.7nm & 656.6nm
- Peak transmittance: 85%
- Thickness: 1.85 ± 0.05mm
- Barrier property: ≥OD5 at 200-1100nm
- Surface finish: 60/40
- Parallelism: 30″

Package Included:
- 1 x E1 Filter