The Askar Colour Magic C2 Duo Band (SII & OIII) filter is an effective tool for capturing deep-sky objects with either a colour CMOS astrophotography camera or DSLR/mirrorless camera. It helps reduce the adverse effects of light pollution, resulting in astrophotos with greater detail and contrast.
The Askar Colour Magic C2 Duo Band filter is primarily optimised for transmitting the SII and OIII emission lines, which play an important role in the study of interstellar nebulae and supernova remnants. Around the 672 nm wavelength (SII band), the filter operates with a 15 nm bandwidth and delivers excellent performance. In the region around 500.7 nm (OIII wavelength), it transmits the useful signal with a 35 nm bandwidth, enabling detailed observation of planetary nebulae and other oxygen-rich objects.
The 2" size allows easy integration into a wide range of astrophotography setups. Its advanced anti-reflective coating effectively minimises unwanted reflections.
Key features of the Askar Colour Magic C2 Duo Band filter:
- 2" size
- Over 90% light transmission
- 15 nm bandwidth in the SII (672 nm) band
- 35 nm bandwidth in the OIII (500.7 nm) band
An advantage of the filter is that, when combined with the Colour Magic C1 Duo Band filter, it can be used with a colour camera to produce Hubble palette-style false-colour images. To achieve this, images captured with the two filters must be combined during digital post-processing.
