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Graded Aperture
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wavelength in nanometers) of the IDAS filter
The comparison photos at right demonstrate (qualitatively) that the IDAS filter maintains better color balance than other filters which have been designed for visual use
What’s in the box
Used IDAS LPS-P2 48mm filter (MBT & IGAD) USED Graded ApertureCondition: This is a used IDAS light pollution suppression filter in very good condition. The optics are reasonably clean, with some minor spotting, and it comes in a jewel case. See the photos. Description: Light pollution suppression (LPS) filters are designed to suppress the common emission lines generated by artificial lighting, yet allow the important nebula emission lines to pass, thus enhancing the contrast of astronomical objects, particularly
