Askar Colour Magic Super D1 Duo Narrowband Filter (OIII&Ha)

Colour Magic Super D1 Duo Narrowband Filter (OIII&Ha)

Colour Magic Super D1 Duo-narrowband filter (OⅢ+Hα) has an ultra-high transmittance over 85% at its center wavelength (500.7nm and 656.3nm). 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

Although it is not a specific high speed filter, through our real test, the Super D Duo-narrowband filter behaves well when using together with a fast telescope even at f/1.9

Specifications

• FWHM : OIII：6.5nm±0.5nm/Ha：8.5nm±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”