CLS Filter
CLS means City Light Suppression, a broadband astronomical filter. It selectively blocks harmful wavelengths, particularly artificial mercury and sodium light and natural skyglow, while transmitting nebular light. High transmission occurs near OIII (496 nm and 500 nm), Hβ (486 nm), NII (654 nm and 658 nm), Ha (656 nm), and SII (672 nm). Broad bandwidth and high throughput make it more suitable for less polluted sites. Frame and packaging: M48*0.75 thread; aerospace aluminum; one-piece CNC; fine sandblasting, anodizing, and internal light suppression; permanent laser engraving; PP box with imported high-pressure white EVA; 340 g silver-card carton with dense foam; sizes 1.25 and 2 inches; ROHS pass. Spectral notes: transmission >95% near OIII (496 nm and 500 nm), Hβ (486 nm), NII (654 nm and 658 nm), Ha (656 nm), and SII (672 nm). Blocking stated as 0.1% suppresses urban high-pressure Na at 589 nm and Hg at 578 nm.
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Overview
Specifications
| Parameter | Value |
|---|---|
| Dimensional Specifications | 1.25''，2'' |
| Transmittance | Transmittance Above 95% for Important Nebular Emission Lines (Such as H-Alpha, OIII, SII, H-Beta) |
| Blocking | >OD3 (0.1%) for Light Pollution Lines Such as Na:589nm and Hg:578nm/435nm |
| Filter Glass Thickness | 1.85mm |
| Glass Material | Schott, Germany |
| Surface Finish | 60/40 (US Military Standard MIL-O-13830) |
Applications
Key Features
Datasheet
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