IDAS LPS-D3 (formerly known as NGS-1) filters enhance the contrast of astronomical emission nebulae against a sky with both man-made and natural* sky glow sources, yet preserve color balance of broadband objects such as galaxies. As with other IDAS interference filters, the bandpasses are designed to accommodate the steep ray angles of fast optical systems.
Features include:
- Ideal flat-top and moderate bandpass
- Excellent in-band transmission
- Steep bandpass edges minimize internal reflections
- Near IR (NIR) is blocked up to 1200nm
- Available in 52mm and 48mm sizes
- 2.5mm thickness (parfocal with other IDAS LPS filters)
- IDAS-proprietary IGAD/MBT/UFP quality
Made in Japan.
Our expert comment:
Starting in 2021, IDAS has merged some of its product lines and updated the item numbers of various filters. For example, the two series NGS-1 and LPS-D2 have now been combined into the LPS-D3 product line.
This does not change the optical properties and excellent quality of these filters, which is achieved, among other things, by the IGAD multi-coating.
However, filters from the previous IDAS product families (such as the 2" LPS-D2) are still available from stock in some cases.
(Jan Ströher)
