IDAS LPS D1 FILTER FOR CANON APS-C
The LPS D1 Filter For Canon APS-C by IDAS:
The IDAS LPS D1 Filter is a Light pollution suppression (LPS) filter that is 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 emission nebulae.
Unlike other light pollution suppression filters, IDAS filters are specifically designed for balanced color transmission using the IDAS unique Multi-Band-pass Technology (MBT) process. The balanced transmission allows color photographs to be taken with minimal color cast to broadband emission objects such as stars, galaxies and globular clusters. 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.
Note: Light pollution suppression filters are not a perfect substitute for dark skies.