IDAS LPS-P3 Light Pollution Suppression Filter

IDAS LPS-P3 Light Pollution Suppression Filter

  (1 Review)
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About this product

Model:  hutech-idas-lps-p3-2
Part Number:  LPS-P3-48

The Japanese-made IDAS P3 LPS is in our opinion the BEST Light Pollution Suppression filter for astro photography with DSLR, colour and mono CCD cameras. 

Latest version from IDAS improves upon the previous P2 and D1 filters.

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).

Unlike other light pollution suppression filters, IDAS filters are specifically designed for balanced colour transmission using the IDAS unique Multi-Bandpass Technology (MBT) process. The balanced transmission allows colour photographs to be taken with minimal colour cast to broadband emission objects such as stars, galaxies and globular clusters.

IDAS LPS filters utilise 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, 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. The filter also blocks infrared so a separate IR blocking filter is not needed.

Note, however, that light pollution suppression filters are not a perfect substitute for dark skies.


  • Updated version from the P2 and D1 filters from IDAS.
  • Targets Mercury and high/low Sodium vapour lines.
  • Stronger UV and NIR block up to 1200nm than previous filters.
  • Improved colour balance for newer one-shot colour cameras.
  • Higher and flatter transmission peaks with deeper optical density – enhancing image contrast and reducing internal reflections.

Transmission Graph

Customer reviews

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First impressions are good!
27 August 2022  | 

I can't compare it to anything as I'm pretty new to AP. But my first go with it on my DSLR, 150PDS produced a much better image of M31 than I was expecting! Not sure how much of that is down to the filter but no doubt it had a lot to do with it. A good choice I think 😊


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Q1. What is the difference between the IDAS D1 filter and the P2 Filter? Which is best for a DSLR?

The only difference between the P2's and the D1's is that the newer D1's block a little more of the red, specifically the SII emission area. Whilst there's not usually much SII available it does help the overall colour balance of an image.

This effect is most useful on a DSLR - on a mono camera you'd be using other filters and we'd recommend a P2 filter. For DSLR's the D1's are more suited.

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