ZWO OIII 7nm Filter - 2" Mounted

Name: ZWO OIII 7nm Filter - 2" Mounted
Brand: ZWO

ZWO

ZWO OIII 7nm 2-inch Filter is an OIII narrowband filter in 2" for mono emission-line imaging.

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Best Current Offer

ZWO USA

In stock

$299.00

Specifications

Filter

Filter type: OIII narrowband filter
Filter size: 2"
Glass thickness: 1.85 mm

Spectral

Passbands: OIII 500.7 nm (7 nm)
Band count: 1 band
Narrowest bandpass: 7 nm
Blocking: Blocks common artificial light and airglow outside the target emission line

Construction

Substrate / coating: Optical glass; Multi-layer anti-reflection coating

Use

Camera use: Mono astronomy cameras
Best for: Emission nebulae

Astrophotography Fit

Best for isolating emission lines with a mono camera and filter wheel.

ZWO OIII 7nm 2-inch Filter is a midrange OIII narrowband filter (2"). Passbands: OIII 500.7 nm (7 nm).

Best for isolating emission lines with a mono camera and filter wheel.

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

Monochrome camera, matching filter wheel, and autofocus offsets
Ha/OIII/SII emission nebula projects
Long integrations with darks, flats, and careful star handling

Not recommended for

Unmodified color cameras as the primary workflow
Targets dominated by broadband continuum signal
Users who want natural star color with minimal processing

Where To Buy

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Retailer	Price	Availability	View Offer
ZWO USA ZWO USA	$299.00	In stock Updated 9/20/2026	View Offer - $299.00

Price History

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ZWO USA