Askar Colour Magic D2 Duo-band Filter (SII+OIII) 2 all astro filters opinie

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Askar Colour Magic D2 Duo-band Filter 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 transmits light emitted by ionized oxygen atoms (OIII) and sulfur atoms (SII). By simultaneously exposing both spectral ranges, it is possible to take great shots without the need for filter wheels or a dedicated set of separate filters. Compared to the Askar Color Magic C2 Duo-band 2" filter, the D2 model is characterized by a reduced half-width of the passband and a much higher equivalent optical density for the blocked bands.

Askar Colour Magic D2 Duo-band Filter 2" is not recommended for visual observations. Under no circumstances should it be used as a solar filter.

Key Features of the Askar Colour Magic D1 Duo-band Filter 2"

• filter with transmittance exceeding 85 percent for SII and OIII bands
• passband half-widths of 6.5 and 8.5 nm for OIII and SII bands
• excellent cutting of emission lines of mercury and sodium lamps thanks to high optical density equivalent (OD5)
• ideal for photographing emission and planetary nebulae
• can be used with very bright astrographs

Technical parameters

• filter type: dual band filter
• Filter diameter: 2"
• filter thickness: 1.85 ± 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): 6.5 ± 0.5 nm
• maximum transmission for OIII band: >85%
• position of the maximum transmittance peak for the SII (CWL) band: 672 nm
• Half width for SII band (FWHM): 8.5 ± 0.5 nm
• maximum transmission for SII band >85%
• 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: >OD5 (200 - 1000 nm)
• surface quality index: 60/40
• parallelism: 30"

Set components

• Askar Color Magic D2 Duo-band Filter 2"

Guarantee

24 months