CCD Filter for Astrophotography

Altair DualBand 6nm Filter Features:

• Capture the two main emission nebulae bands at the same time, whilst suppressing light pollution, moonlight, and airglow.
• Acquire more data in less time, opening up your imaging window, even into the summer months when it isn't quite dark.
• If you have the 6nm Ha/Sii Ultra filter and the Sii/Ha version, you can capture twice the Oiii data in each imaging session and combine them for true SHO Hubble style imaging with a colour camera!
• Extremely steep bandpass yields maximum contrast in extreme light pollution: 6nm FHWM centred on 500.7nm Oiii wavelength, and 5.5nm FHWM centred on the 656.28nm Ha wavelength.
• No halos. We have not had any reports of halos caused by this filter in testing, and we don't expect any with our new V2 hard coating technology.

This is the new QuadBand V2 Coating technology which includes:

• Halo suppression. We have not had any reports of halos caused by this filter in testing.
• Increased blocking of UV, IR and unwanted visual range wavelengths. UV OD7 (T0.00001%) Visual OD5 (T0.001%) and IR OD4 (T0.01%) for the ultimate in skyglow blocking.
• Higher transmission % of desired wavelengths Ttop 95% (Average 5% higher transmission of desired wavelengths).
• Ha and Oiii wavelengths at 35nm FWHM for with less tail-off to reduce unwanted light pollution.