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 emission nebulae (see filter plots). The most recently introduced version (D2) has a bandpass designed to cope with the increasing trend of society's switch to LED lighting.
Unlike other light pollution suppression filters, IDAS filters are specifically designed for balanced color transmission using the IDAS unique Multi-Bandpass 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.
LPS filters utilize the unique IDAS Ion Gun Assisted Deposition (IGAD*) coating technology for superior coating durability (quartz hardness) and safer cleaning. IGAD coatings also improve temperature and humidity stability of the filter performance, reducing spectrum shifts down to +/-1nm from the +/-3 or 4nm shift of standard coatings.
CCD imaging can also benefit, because although CCD imagers can already shoot through light pollution to some extent, including an LPS filter to the setup gives an added (signal-to-noise) edge as shown in these CCD examples (comparison testing by G. Tomita in Tokyo). LPS filters are available for 1-1/4" and 2" (48mm) eyepieces, as well as in numerous sizes to accomodate most popular camera lenses. Each filter lot is tested and a plot of the spectral response of the lot is provided with each filter (see filter plot sample).
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Have only had the chance to test it once and it did well so far. I did notice it cut my exposure times in half allowing more light through than the Broadband filter I had been using so this might work out well. Will need more practice to post a detailed review. Shipping was fast and purchase price was best I could find. Communication with Skygaze was great.
Just what I need to reduce light from high pressure sodium lamps.
I usually shoot nb in my dome, but recently started to explore OSC. I have a lot of LP (bortle 6) here at home and needed a LP filter. I had a LP-pro which seemed okay, not overly impressive. And I saw a demo of this filter and ordered on the spot. I'd love to do a side by side comparison as the season continues but 30 our of 32 nights have been cloudy. I did get one chance to try the filter and I'm quite pleased with the results.