ZWO Duo-Band Filter - 2" Mounted
ZWO
ZWO Duo-Band 2-inch Filter is a Dual-band nebula filter in 2" for nebula imaging and light-polluted skies.
Best Current Offer
Specifications
Filter
- Filter type
- Dual-band nebula filter
- Filter size
- 2"
- Glass thickness
- 1.85 mm
Spectral
- Passbands
- H-alpha 656.3 nm (15 nm) / OIII 500.7 nm (35 nm)
- Band count
- 2 bands
- Narrowest bandpass
- 15 nm
- Widest bandpass
- 35 nm
- Blocking
- Suppresses moonlight, skyglow, and common artificial light outside Ha/OIII
Construction
- Substrate / coating
- Schott substrate material; Multi-layer anti-reflection coating
Use
- Camera use
- One-shot color astronomy cameras and modified DSLRs
- Best for
- Emission nebulae from light-polluted skies
Astrophotography Fit
Best for emission nebulae with one-shot color cameras, especially from light-polluted skies.
ZWO Duo-Band 2-inch Filter is a budget-friendly Dual-band nebula filter (2"). Passbands: H-alpha 656.3 nm (15 nm) / OIII 500.7 nm (35 nm).
Best for emission nebulae with one-shot color cameras, especially from light-polluted skies.
Choose filter size around the sensor diagonal, telescope speed, and filter-wheel or drawer geometry. Flats are still required; a filter can improve contrast, but it will not rescue tilt, bad focus, or poor calibration.
Best paired with
- One-shot color cooled cameras or modified DSLRs
- Emission nebulae rich in H-alpha, OIII, SII, or H-beta signal
- Filter drawer or wheel sized to avoid vignetting
Not recommended for
- Broadband galaxies, reflection nebulae, or clusters as the main use case
- Monochrome SHO workflows that need separate channels
- Very fast optics unless bandpass shift and halos have been checked
Where To Buy
Some links on this page are affiliate links. Prices and availability are pulled automatically from each retailer and updated daily.
| Retailer | Price | Availability | View Offer |
|---|---|---|---|
| Cloud Break Optics Cloud Break Optics | $99.00 | In stock Updated 5/10/2026 | View Offer - $99.00 |
| Mile High Astronomy Mile High Astronomy | $169.00 | In stock Updated 5/14/2026 | View Offer - $169.00 |
| ZWO USA ZWO USA | $169.00 | In stock Updated 5/15/2026 | View Offer - $169.00 |
Price History
Chronological retailer pricing with out-of-stock points shown at reduced opacity.