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IDAS LPS-D3 (formerly NGS1) Light Pollution Suppression Filters |
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![]() IDAS LPS-D3 (formerly NGS1) light pollution suppression filters enhance the contrast of astronomical emission nebulae against a sky with both man-made and natural* sky glow sources, yet preserve color balance of broadband objects such as galaxies. As with other IDAS interference filters, the bandpasses are designed to accommodate the steep ray angles of fast optical systems. Features include: ![]() ![]()
* Natural sky glow sources blocked include upper atmosphere oxygen and sodium lines which become visible from high-altitude, dark sky sites. See videos at the bottom of this page for background information on natural sky glow.
Additional Information on Natural Sky Glow
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