新一批IDAS光学滤镜经已于近日抵港。IDAS LPS-D3 48mm 光害滤镜抑制人工照明（特别是 LED 照明）所产生的常见发射线，同时允许星云发射线通过，从而增强天文物体或星云的对比度。

IDAS NBZ UHS 双波段星云增强滤光片 48mm 是一种新型双窄带滤光片，旨在增强 Ha 和 OIII 发射星云的对比度。它旨在减少 NBX 的内部反射，并在与快速光学系统一起使用时适应光谱偏移，特别针对f/2水平的如Celestron RASA或Starizona HyperStar系统而优化。

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A new batch of IDAS optical filters has arrived in Hong Kong recently. IDAS LPS-D3 Light Pollution Filter 48mm suppress the common emission lines generated by artificial lighting, particularly LED lighting, while allowing the nebula emission lines to pass. The contrast of astronomical objects or nebulae is therefore enhanced.

IDAS NBZ UHS Dual Band Nebula Boost Filter 48mm is a new dual narrowband filter designed to enhance the contrast of Ha and OIII emission nebula. It aims to reduce internal reflection of NBX and accommodate the spectral shift when used with fast optical systems, specially optimized for f/2 optical system like Celestron RASA or Starizona HyperStar system. 

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1. IDAS LPS-D3 Light Pollution Filter 48mm 光害滤镜 https://www.astro.hk/catalogs/products/id/529

2. IDAS NBZ UHS Dual Band Nebula Boost Filter 48mm 滤镜 https://www.astro.hk/catalogs/products/id/530