Astronomik CLS Light Pollution Filter
Best light-pollution filter for urban stargazers seeking clearer deep-sky views.
This filter is a essential tool for astrophotographers battling urban light pollution. It selectively blocks the harsh glare of city lights while preserving the critical light needed to capture detailed images of nebulae and galaxies.
$169.95
at
Highpointscientific
More CLS options
Who it's for
- Urban astrophotographers targeting faint emission nebulae
- SCT owners needing a secure, tilt-free optical connection
- Serious imagers prioritizing long-term durability and light transmission
Who should skip it
- Observers focused on galaxies, star clusters, or planetary detail
- Budget-conscious buyers needing a versatile, multi-telescope filter
- Photographers wanting natural color balance without extra post-processing
Performance breakdown
Urban contrast enhancement
Significantly darkens background skies to make faint nebulae pop against city glow.
Transmission efficiency
High peak transmission ensures minimal light loss during critical deep-sky observations.
Build durability
Robust glass construction withstands frequent handling and outdoor temperature fluctuations.
Installation ease
Standard SCT threading makes attaching this filter to your telescope seamless.
Nebula detail clarity
Sharpens structural definition in emission nebulae by isolating key spectral lines.
Long-term reliability
The decade-long warranty reflects exceptional confidence in the filter's optical longevity.
Key Specs
Filter Type
Light Pollution/City Light Suppression
Filter Size
31.75mm (1.25 inches)
Barrel Diameter
1.25 inches
Peak Transmission
97% at H alpha
Optical Thickness
1 mm
Coating
Multi-layer
Compatibility
f/3 to f/15 focal ratios
Warranty
10 Years
Country of Origin
Germany
Connection Interface
SCT Thread
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