Do you want to photograph emission nebulae and deep-sky objects with your color camera, but suffer from light pollution? Then the ZWO Duo-Band 1.25″ is the ideal upgrade. Designed for astrophotography with ZWO ASI Color cameras, such as the ASI533MC or ASI2600MC, this dual narrowband filter allows you to capture Hα and OIII light without a complex setup.
What exactly does the filter do?
- Passes only the specific wavelengths of hydrogen (Hα at 656 nm) and oxygen (OIII at 500 nm)
- Blocks stray light from street lights and moonlight
- Enhances the contrast and detail of nebulae, supernova remnants and planetary nebulae
Its combination of simplicity, effectiveness and price makes it one of the most popular upgrades for beginners and advanced color camera users alike.
What you can see / photograph with it
✓ Emission nebulae (such as the Veil Nebula or Orion Nebula)
✓ Planetary nebulae with rich detail
✓ Supernova remnants
✓ Deep-sky objects in light-polluted environment
✓ Improved contrast in photography with ASI Color cameras
Specifications
| Feature | Value |
|---|---|
| Filter type | Duo-band narrowband filter |
| Appropriate size | 1.25″ (31.7 mm) |
| Material mount | Aluminum |
| Light transmission OIII | >90% at 486, 496, 501 nm |
| Light transmittance Hα | >80% at 656.3 nm |
| Bandwidth | OIII: 35 nm, Hα: 15 nm |
| Visual use | Possible, but primarily intended for photography |
| Compatible with | All 1.25″ focusers and color cameras (ZWO ASI MC series) |
| Application | Light pollution suppression, contrast enhancement, deep-sky imaging |
| Design | UHC-type duo filter |
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