H-Beta Filter
H-Beta is a visual narrowband filter for blue 486 nm line-emission nebulae, suppressing other light to improve contrast. Like O-III 25 nm filters, it requires large-aperture telescopes to gather enough light from faint objects; small apertures are not recommended. The 486 nm hydrogen β line suits the Horsehead in Orion and the California Nebula and makes the Horsehead more visible. Source frame and packaging: M48*0.75 thread; aerospace aluminum; one-piece CNC; fine sandblasting and anodizing with 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 exceeds 88% near Hβ at 486 nm. Effective blocking is stated as 0.1% for urban high-pressure Na at 589 nm and Hg at 578 nm. Selective transmission improves contrast, not brightness.
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Overview
Specifications
| Parameter | Value |
|---|---|
| Dimensions | 1.25”，2” |
| Peak Transmittance Tmax [@486nm H-Beta Light] | Tmax@486nm H-Beta Light Transmittance Above 90% |
| Bandwidth (FWHM) | 12±2nm |
| Blocking Range (Blocking Area) | 400-700nm |
| Filter Glass Thickness [Ensures High Flatness of 1/4λ During Optical Processing] | 1.85mm |
| Glass Material | Schott B270 |
| Surface Finish | 60/40 (US Military Standard MIL-O-13830) |
Applications
Key Features
Datasheet
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