ZWO Duo-Band Filter - 2" Mounted

Name: ZWO Duo-Band Filter - 2" Mounted
Brand: ZWO

ZWO

ZWO Duo-Band 2-inch Filter is a Dual-band nebula filter in 2" for nebula imaging and light-polluted skies.

imaging-filter $

Best Current Offer

Cloud Break Optics

In stock

$99.00

Other retailers

Mile High Astronomy (In stock)
$169.00
ZWO USA (In stock)
$169.00

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 9/20/2026	View Offer - $99.00
Mile High Astronomy Mile High Astronomy	$169.00	In stock Updated 9/19/2026	View Offer - $169.00
ZWO USA ZWO USA	$169.00	In stock Updated 9/20/2026	View Offer - $169.00

Price History

Chronological retailer pricing with out-of-stock points shown at reduced opacity.

Cloud Break Optics Mile High Astronomy ZWO USA