ZWO Filter-Set H-alpha, SII, OIII 1.25″ - narrowband shots for maximum nebular detail
This high-quality narrowband filter set is designed specifically for astrophotography with monochrome cameras. With a bandwidth of only 7 nm, the H-alpha, SII and OIII filters each isolate their specific emission line, revealing high-contrast faint nebular structures. Light pollution is effectively suppressed even under urban skies.
What does each filter do?
- H-alpha (656 nm): For emission nebulae and HII regions
- OIII (501 nm): For planetary nebulae and supernova remnants
- SII (672 nm): For sulfur emissions in deep emission areas
Together they make the classic Hubble palette (SHO) possible - a popular color combination among astrophotographers.
Compatibility:
These filters are homofocal with ZWO LRGB filters and fit all 1.25″ filter wheels (such as the ZWO EFW 8×1.25″). They are optimally matched to cameras such as the ASI1600MM, 183MM or 294MM Mono.
What you can capture with it
✓ Hydrogen nebulae such as the Rosette Nebula and California Nebula
✓ Supernova remnants such as the Veil Nebula
✓ Planetary nebulae such as the Helix Nebula
✓ Hubble-style SHO images with mono cameras
✓ Deep-sky targets with minimal light pollution
Specifications
| Feature | Value |
|---|---|
| Filter type | Narrowband filter set (Hα, SII, OIII) |
| Format | 1.25 inches (31.7 mm) |
| Half-value width | 7 nm |
| Transmission | >80% |
| Housing | Aluminum |
| Design | Line filter |
| Compatibility | Filter wheels with 1.25″ slots (such as ZWO EFW) |
| Use | Astrophotography with mono cameras |
| Series | ZWO Filter Series |
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