Askar Colour Magic C2 Duo-band 2" is a high-quality filter that can dramatically improve the contrast and detail of photographs of nebulae, even in conditions of heavy light pollution.

This filter allows light emitted by ionized oxygen atoms (OIII) and sulfur (SII) to pass through. By exposing both spectral ranges simultaneously, it is possible to take great shots without the need for filter wheels or a dedicated set of separate filters.

Note! The Askar Colour Magic C2 Duo-band 2" filter is not recommended for visual observations. Under no circumstances should it be used as a solar filter.

Key Features of the Askar Colour Magic C2 Duo-band 2" Filter

• filter with a transmittance of over 90 percent for the OIII and SII bands
• excellent cutting of emission lines of mercury and sodium lamps thanks to high optical density equivalent (OD3)
• ideal for photographing emission and planetary nebulae

Technical parameters

• filter type: dual band filter
• Filter diameter: 2"
• filter thickness: 2 ± 0.05 mm
• filter shape: round
• transmitted bands: SII, OIII
• position of the maximum transmittance peak for the OIII (CWL) band: 500.7 nm
• Half-width for the OIII band (FWHM): 35 ± 5 nm
• maximum transmission for OIII band: >90%
• position of the maximum transmittance peak for the SII (CWL) band: 672 nm
• Half width for SII band (FWHM): 15 ± 3 nm
• maximum transmission for SII band >90%
• blocked bands: mercury lamps (435.8 nm, 546.1 nm, 577 nm, 578.1 nm), sodium lamps (598 nm, 589.6 nm, 615.4 nm, 616.1 nm)
• equivalent optical density for blocked lines: OD3 (200 - 1000 nm)
• surface quality index: 60/40

Set components

• Askar Color Magic C2 Duo-band 2" filter

Guarantee

24 months