Light Pollution Suppression (LPS) Filters



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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 (formerly Tokai) 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. 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.

See also comparison film astrophotos (Set 1 and Set 2) which demonstrate the actual effect of the LPS filter.

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).

Additional independent tests and reviews are available here:

Note, however, that light pollution suppression filters are not a perfect substitute for dark skies. Refer to our discussion of the limitations and common misconceptions about light pollution suppression filters.

LPS filters are available for 1-1/4" and 2" (48mm) eyepieces, as well as in numerous sizes to accomodate most popular camera lenses. Custom sizes are also available by special order. Each filter lot is tested and a plot of the spectral response of the lot is provided with each filter (see filter plot sample).

Filter Accessories

  • A convenient holder to allow quick removal/insertion of your filter. Direct coupling to Borg scopes or to 2" eyepiece tubes (adapter required) is possible.
  • SCT users: Need a filter for direct attachment to your Meade or Celestron SCT? Check out our Borg SCT filter holder and LPS filter combo set.
  • Now available for users of AstroPhysics refractors with 2.7" focusers: filter holder sets with 72mm LPS filters.

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