ZWO Narrowband Filters

Narrowband imaging works by isolating specific light wavelengths emitted by nebulae. Using the Ha, OIII, and SII set allows you to map these different wavelengths to specific color channels, enabling you to create the iconic 'Hubble Palette' images that reveal structural details invisible to standard RGB cameras.

Yes, these are specifically designed for that environment. By isolating only the light emitted by nebulae and blocking almost everything else—including common city light sources like mercury and sodium vapor—they allow you to capture high-contrast data even from bright, urban skies.

FWHM, or Full Width at Half Maximum, refers to the bandwidth of light the filter lets through. A 7nm width is narrow enough to effectively cut out most light pollution while still being wide enough to allow plenty of signal from your target, striking a great balance between contrast and exposure time.

Yes, these filters are designed for monochrome astrophotography cameras. Because they isolate specific wavelengths, they must be used sequentially with a monochrome sensor to build up a color image, rather than with a one-shot color camera.

These filters are designed to fit standard filter wheels and drawers used in astrophotography setups. They feature a 2.0 mm glass thickness, which is the industry standard for most filter carousels, ensuring they will sit parfocal with other common filters.

The built-in IR cut-off blocks unwanted infrared light between 700-1100nm. This prevents star bloating and helps keep your images sharp, as infrared light often focuses differently than visible light and can degrade the overall clarity of your final stack.