ANTLIA QUAD BAND ANTI-LIGHT POLLUTION FILTER

The Antlia Quad Band Anti-Light Pollution filter is a unique light suppression filter for colour cameras. Its spectral transmission passes through the visible light region as well as the near-ultraviolet and near-infrared ends of the spectrum.

The Quad Band filter can be used to capture broadband and narrowband targets such as galaxies, reflection and emission nebulae and star clusters from locations with heavy light pollution. The wide bandpasses make it suitable for optics as fast as f/2.

Certain broadband targets such as M51 and M83 possess significant signal in the near-infrared (NIR) region, which are often difficult to capture using standard light pollution filters that cut off the ends of the spectrum. As modern CMOS cameras are very sensitive to these wavelengths and there tends to be less artificial light pollution in this region, the Quad Band filter features high NIR transmission.

Like all Antlia filters, the Quad Band filter has excellent halo suppression, making imaging of targets surrounded by bright stars such as the Horsehead Nebula pain-free.

Note: The Quad Band filter passes light in the near-UV and near-IR, so fast refractors may show some lateral chromatic aberration. As many popular one shot colour cameras have a UV/IR-cut window, this must be swapped for an AR-cut window or the filter will effectively become dual-band.

• Available in 2" mounted.

• Blocks the artificial light from mercury vapour lamps, both high and low pressure sodium vapour lights and the unwanted natural light caused by neutral oxygen emission in our atmosphere (i.e. skyglow).

• Maximum transmission of the main nebula emission lines at OIII (500.7nm),  H-alpha (656.3nm), H-beta (486.1nm), SII (671.6nm) & NII (658.3nm) is >92%. 

• Optical density of OD4 @ 300-1050nm.

• Ideal for urban areas with extreme light pollution.

• Ultra-thin filter cell to maximise the compatibility with most filter drawers.

To even further enhance the contrast, and suppress the stray light and internal reflections, Antlia applies edge-blackening coating on each filter. Each filter is individually tested to ensure a high quality standard. The tight tolerance of the filters substrate assure a maximum deviance of ±0.05 from specifications making these filters parfocal.

DO NOT LOOK AT THE SUN WITH ANTLIA FILTERS. Serious eye damage will occur.