Filter Askar C2 Color Magic C1 Ha/OIII 2"

When shooting deep-sky Nebulae with color cameras, a duo-band filter in the Hα +OⅢ bands is often used; whereas with a mono camera, a narrowband filter in the Hα, SⅡ, and OⅢ bands is often used, leaving users with color cameras missing one band of nebula detail. This can be compensated by using the Colour Magic C Duo-band filter (SⅡ+OIII) mentioned above.

Colour Magic C2 Duo-band filter (SII+OIII) has a high transmittance of over 90% at its center wavelength (500.7nm and 672nm). It can effectively improve the quality of the image by making the sky background of the image darker while maximizing the contrast throughout the image， enhancing the contrast of your pictures, and making it easier to display the details of the stars. 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.

Caractéristiques:

• FWHM
  OIII：35nm±5nm
  SII：15nm±3nm
• CWL: 500.7nm & 672nm
• Peak transmittance: 90%
• Thikness: 2 ± 0.05mm
• OD3 @ 200-1000nm
• Surface : 60/40