|Filtres | Filtres Pollution Lumineuse / Light pollution filters |
IDAS LPS 48MM SCT (SCT)
For direct attachment of an LPS filter to the back of a Meade or Celestron SCT, this package offers a flexible solution -- an SCT compatible filter holder for 48mm filters.
The filter holder consists of Borg components 7424 and 7502 which hold the LPS filter between the two pieces as shown below. The telescope-side piece is a female SCT-thread while the eyepiece/camera side provides a male SCT-threaded interface, making it easy to insert the filter into an SCT system.
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. The IDAS filter maintains better color balance than other filters which have been designed for visual use.
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 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.