About this product
New QRO version of the IDAS D1 LPS filter
- 1.1mm glass thickness - minimises optical distance and refraction.
- Precision machined filter frame - knife-edge top ring with matte-finish taper shaped design dramatically reduces ghost reflections from bright stars.
The Japanese-made IDAS D1 LPS is in our opinion the BEST Light Pollution Suppression filter for astro photography with DSLR, colour and mono CCD cameras.
Following from the highly successful IDAS P2 LPS, the D1 has been optimised for one-shot colour and modified DSLR cameras. The key concept of the D1 LPS is to reduce the reddish background cast whilst blocking as much light pollution as possible improving upon the already good colour balance of the P2 LPS.
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 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. 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.
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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.