The Hutech IDAS P2 LPS is in our opinion the BEST Light Pollution
Suppression filter for astro photography with DSLR and colour CCD cameras.
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
Hutech IDAS 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, 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.
Note, however, that light pollution suppression filters are not a
perfect substitute for dark skies.
LPS filters are available in 1.25" and 2" threaded cells, other sizes
are available on request.
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