Astrodon Nitrogen II (NII) 3nm Narrowband Filter - 1.25" Mounted

Name: Astrodon Nitrogen II (NII) 3nm Narrowband Filter - 1.25" Mounted
Brand: Astrodon

Astrodon

Nitrogen II (NII) Narrowband 3 nm Filter - 1.25" Mounted is a narrowband filter in 1.25" for mono emission-line imaging.

imaging-filter midrange

Astrodon Nitrogen II (NII) 3nm Narrowband Filter - 1.25" Mounted

Best Current Offer

Cloud Break Optics

Out of stock

$682.00

Specifications

Filter

Filter type: Single-line narrowband filter
Filter size: 1.25" / Mounted

Spectral

Passbands: NII 658.3 nm (3 nm)
Band count: 1 band
Narrowest bandpass: 3 nm

Use

Camera use: Mono astronomy cameras

Astrophotography Fit

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

Nitrogen II (NII) Narrowband 3 nm Filter - 1.25" Mounted is a midrange narrowband filter (1.25").

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
Cloud Break Optics Cloud Break Optics	$682.00	Out of stock Updated 9/20/2026	View Offer - $682.00

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