NIGHT GLOW & LIGHT POLLUTION SUPPRESSION FILTER

IDAS NGS1

Suppresses urban light pollution and atmospheric nightglow while preserving true-to-life celestial color balance.
The official next-generation successor to the globally acclaimed IDAS LPS-D3.

IDAS NGS1 Filter
*IDAS NGS1 (Standard M48 mount) filter appearance. Simultaneously suppresses atmospheric airglow and white LED glare while preserving natural star colors.

Simultaneous Nightglow & White-LED Suppression with True RGB Color Fidelity

Even at remote dark-sky sites, long exposures often suffer from a washed-out sky background caused by natural atmospheric airglow (emissions from upper-atmosphere oxygen and sodium atoms). Meanwhile, conventional light pollution filters frequently introduce heavy teal or magenta color casts that destroy the natural colors of stars and galaxies.

The IDAS NGS1 (Night Glow Suppression 1) is the official successor to the legendary LPS-D3, engineered as a universal base light-pollution filter. It selectively suppresses modern white-LED glare and natural airglow while maintaining neutral RGB energy balance — rendering stars, galaxies, reflection nebulae, and molecular clouds with natural, unshifted colors.

Precision RGB Energy Balance — Zero Unnatural Color Cast

Through IDAS's proprietary spectral design, total light energy reaching the Red (R), Green (G), and Blue (B) pixels of color sensors is meticulously balanced. Continuous-spectrum galaxies like Andromeda (M31), delicate blue reflection nebulae like the Pleiades (M45), and true stellar color indices are reproduced faithfully without color distortion.

💡 NGS1 Spectral Highlights: Pinpoints and attenuates dominant natural airglow lines (OI 557.7nm, OI 630.0nm, Na 589nm) alongside white-LED, mercury, and sodium light pollution peaks while maintaining high, balanced transmission across the visible spectrum and Hα.

Optical Mechanism & Spectral Transmission Characteristics

* Pinpoint Suppression of Natural Airglow & Urban White-LED Peaks

Sharply attenuates the dominant upper-atmosphere airglow lines (OI 557.7nm green airglow, OI 630.0nm red airglow, and Na 589nm) as well as the yellow-green phosphor peak of white LED streetlights and traditional mercury/sodium vapor lamps. From suburban backyards to dark mountain sites, NGS1 darkens the sky background to reveal faint molecular clouds and outer galactic halos.

* IDAS NGS1 Official Spectral Transmittance Data

IDAS NGS1 Spectrum Chart

* Official IDAS NGS1 spectral transmittance curve. Selectively blocks LED pollution and natural airglow lines while preserving natural RGB color balance.

NGS1 Filter 3 Key Strengths

1 Simultaneously suppresses natural airglow (OI 557.7nm / 630nm, Na 589nm) and urban white-LED skyglow for dark, high-contrast backgrounds.
2 Meticulously balances RGB channel energy so galaxies, reflection nebulae, and star colors remain natural and true to life.
3 Serves universally as an always-on base filter for one-shot color cooled CMOS/DSLRs and as a high-SNR Luminance (L) filter for mono LRGB imaging.
💡 Recommended Cameras & Optimal Applications for NGS1
1. One-Shot Color (OSC) Cooled CMOS Cameras (Primary Base Filter) Pairs seamlessly with modern BSI color CMOS sensors (IMX571, IMX533, IMX585, IMX2400, etc.). Cuts urban skyglow and airglow in a single exposure while preserving natural RGB balance across all celestial targets.
2. Digital SLRs & Mirrorless Cameras (Astro-Modified & Stock) On astro-modified cameras, 100% of Hα (656.3nm) transmittance is utilized to boost red nebulae while suppressing sky fog. Even on unmodified cameras, NGS1 tightens the background sky while preserving natural color reproduction.
3. High-SNR Luminance (L) Booster for Monochrome LRGB Imaging When shooting LRGB with a monochrome cooled CMOS camera, replacing a standard clear UV/IR-cut (L) filter with NGS1 removes harmful light pollution and airglow across the visible band to capture high-contrast Luminance frames in less time.

Specifications & Optical Characteristics

Filter Type Natural Nightglow & Light Pollution Suppression Base Filter (Official LPS-D3 Successor)
Primary Passbands RGB-Balanced Broadband Visible Spectrum (High Transmittance at OIII / Hβ / Hα)
Primary Blocked Bands OI 557.7nm / OI 630.0nm / Na 589nm (Natural Airglow, White LED, Mercury & Sodium Peaks)
Substrate & Coating 2.0mm Optically Polished Glass + Durable Ion-Assisted Deposition (IAD) Multi-Layer Coating
Available Mount Sizes M48 (48ST2), M42 (OL7.5), M54 (OL7.5), DZ (for ZWO Drawer), DRT (for Canon EF-EOS R), CA (for EOS APS-C)
Manufacturing & QA Made in Japan (ICAS Enterprises Co., Ltd. Optics Division), Individual Spectral Test Report Included

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🌐 Worldwide Availability: For optimal regional pricing and fast local shipping, order via our Authorized Dealers (USA / Europe / Asia) ↗. Overseas orders are also accepted via our authorized shop on BASE (international shipping & handling apply).

💡 Purchase Information & Authorized Dealers

IDAS products are available through our authorized domestic online shop (BASE), as well as authorized astronomical telescope specialty dealers worldwide. For physical demonstrations, mounting consultations, or store points, please visit your local authorized dealer.

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