Telescopes Canada will be closed for shipping and pick-up orders from Friday June 24th to Monday June 27th inclusive. Online orders will still be accepted as per normal and will be shipped Tuesday June 28th. Technical support will continue to be available.
NOTE: Some manufacturer back order lead times are longer than usual. Please ask us regarding specific products.
IDAS LPS-D3 (formerly NGS1) Light Pollution Suppression Filters
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.
*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.
IDAS LPS-D3 (NGS1) band pass (measured production filter data) and important blocked spectral lines.
IDAS LPS-D3 (NGS1) band pass and astronomical emission lines.