Colour Magic 2″ OIII 3nm

Askar Colour Magic 2” OIII 3nm filter

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

Technical specifications

• Bandwidth : 3 nm centered on 500.7 nm (OIII line)
• Format: 2" (50.8 mm)
• Maximum transmission : Approx. 85-90% at 500.7 nm
• Thickness : 1.85 ± 0.05 mm
• Optimization : Reduces halos around bright stars

Benefits

• Contrast enhancement : Enhances the contrast of OIII-emitting nebulae.
• Imaging in conditions of high light pollution : Allows imaging even under polluted skies.
• Reducing the brightness of stars: Reduces the intensity of surrounding stars for better contrast.
• Compatibility with other filters: Can be used in combination with H-alpha and SII filters to create Hubble palette images (SHO).

Astrophotography applications

The filter Askar Colour Magic OIII 3nm is particularly suitable for :

• Imaging planetary nebulae : Ideal for capturing the details of OIII-rich planetary nebulae.
• Capturing supernova slag : Perfect for photographing supernova remnants rich in ionized oxygen.
• Photographing diffuse nebulae : Capture the details of diffuse nebulae emitting ionized oxygen.

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 OIII-emitting objects, even under difficult viewing conditions.

Conclusion

The Askar Colour Magic OIII 3nm 2” filter” is a must-have for astrophotographers specializing in imaging nebulae and OIII-emitting celestial objects. Its ability to enhance contrast and reduce halos while enabling imaging under conditions of light pollution makes it an indispensable tool for deep-sky observers.