Baader Narrowband Filter Set 6.5nm 2" (H-alpha/O-III/S-II)
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Vai al moduloThe Baader Narrowband Filter Set 6.5nm 2" (H-alpha / O-III / S-II) is the professional combination of three precision-grade narrowband filters, optimized for CMOS cameras, designed for tri-color imaging of emission nebulae in the famous "Hubble" palette (SHO).
Three filters, one palette
The set includes an H-alpha filter (656.3nm), an O-III filter (500.7nm) and an S-II filter (671.7nm), all with a 6.5nm FWHM bandwidth — the optimal bandwidth for optical systems from f/10 to f/3.5, the range covering the vast majority of amateur telescopes in use. The three bands are calibrated to allow 1:1:1 exposures, matched to the typical quantum efficiency and signal-to-noise ratio of modern CMOS sensors.
Baader CMOS-Optimized technology
Each filter is coated with Reflex-Blocker™ treatment, which eliminates unwanted reflections even in the presence of auxiliary optics, and with Life-Coat™ technology: a hardened coating that does not peel, degrade, and lasts the entire life of the filter even in the most extreme conditions. The edges are blackened all around, with a visual indicator on the front side for correct orientation during mounting. Each filter is individually polished and coated, with no exposed coating edges.
Technical specifications
| Parameter | Value |
|---|---|
| Filters included | H-alpha, O-III, S-II |
| Central wavelengths | 656.3 / 500.7 / 671.7 nm |
| Bandwidth (FWHM) | 6.5 nm |
| Format | 2" (50.8mm), M48 thread |
| Recommended optical systems | f/10 to f/3.5 |
| Filter thickness | 2 mm |
| Coating | Reflex-Blocker™, Life-Coat™ |
| Brand | Baader Planetarium |
Who it's for
Ideal for astrophotographers who want to create false-color images in the "Hubble Palette" style of emission nebulae, planetary nebulae and supernova remnants, even under strong light pollution and with the moon high in the sky. Compatible with 2" filter wheels and most monochrome CMOS cameras for astrophotography.