Colour Magic 2″ SII 3nm

Askar Colour Magic SII 3nm 2” filter”

The Askar Colour Magic SII 3nm 2” filter” is a specialized narrow-band filter for astrophotography, designed to capture ionized sulfur emissions in nebulae. Its main features are as follows:

Technical specifications

• Bandwidth : 3 nm centered on 672 nm (SII line)
• Format: 2” (50.8 mm) with M48x0.75 male thread
• Maximum transmission : More than 90% at 672 nm
• Thickness : 1.85 ± 0.05 mm
• Barrier property : ≥OD5 at 200-1100 nm

Benefits

• Enhanced contrast : Greatly increases the contrast of nebulae emitting in SII.
• Reducing light pollution : Effectively blocks light pollution and night glow.
• Reducing the brightness of stars: Reduces the brightness of surrounding stars.
• Compatibility with other filters: Can be used in combination with H-alpha and OIII filters to create Hubble palette images (SHO).

Astrophotography applications

The filter Askar Colour Magic SII 3nm 2” is particularly suitable for :

• Imaging emission nebulae : Ideal for capturing the details of nebulae rich in ionized sulfur.
• Capturing planetary nebulae : Perfect for photographing planetary nebulae and their delicate structures.
• Photograph of supernovae remnants : Useful for astrophotographers seeking to capture the phenomena of supernovae and their remains.

Additional considerations

It's important to note that this filter requires longer exposure times due to its very narrow bandwidth. However, it offers an excellent signal-to-noise ratio for SII-emitting objects, even under difficult viewing conditions.

Conclusion

The Askar Colour Magic SII 3nm 2” filter” is an excellent choice for astrophotographers specializing in imaging nebulae and celestial objects emitting in the SII line. Its ability to block light pollution while offering exceptional contrast makes it an essential tool for capturing detailed images of the deep sky.