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- Description
- Features
- Price Guarantee
- Reviews
IDAS LPS-D3(formerly NGS1) 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.
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 (D3) 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).
Features include:
- Ideal flat-top and moderate bandpass
- Excellent in-band transmission
- Steep bandpass edges minimize internal reflections
- Near IR (NIR) is blocked up to 1200nm
- Available in 52mm and 48mm sizes
- 2.5mm thickness (parfocal with other IDAS LPS filters)
- IDAS-proprietary IGAD/MBT/UFP quality
- Made in Japan
* Natural sky glow sources blocked include upper atmosphere oxygen and sodium lines which become visible from high-altitude, dark sky sites.
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Customer Reviews
Let me start by saying I knocked one star off not because of Nick and Skygaze. The whole experience of ordering and follow on communication is outstanding, and I will definitely order from Nick in the future. The rating downgrade comes from the fact this filter is ever so slightly thinner than the ZWO lum filter I was replacing. That means it can rotate within its well in the ZWO filter wheel, which really messes up flats. Solved the problem by installing the thinnest strip of foam i could find on the lip of the well so the filter rests on the foam. That solved the rotation problem, but it's not the best solution. New gear curse in full swing, too many clouds to properly evaluate the filter itself, but will update this review when I can do a side-by -side comparison of light pollution suppression from my Bortle 5 back yard. Again, the SkyGaze Optics experience is stellar (haha).
Only had a few nights of using it but so far it’s great! Make sure you take your calibration frames because it helps with color correction. Can’t say anything bad it does a great job of blocking light pollution from my Bortle 5.
Seems good. I have not yet processed files but I'll be surprised if it is not what it was advertised to be.
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.
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