ZWO Narrowband Filter

This set includes the three essential narrowband filters for deep-sky astrophotography: OIII (Oxygen III), H-Alpha (Hydrogen-Alpha), and SII (Sulfur II). These allow you to isolate specific wavelengths of light to create high-contrast images of nebulae.

These filters are designed with a standard 1.25-inch barrel diameter. They are compatible with most standard filter wheels and camera setups that accept 1.25-inch threaded filters.

The 1/4 wave accuracy refers to the precision of the optical surface. This high level of flatness ensures that the light passing through the filter remains undistorted, which is critical for maintaining sharp, clear focus across your entire image frame.

Yes, these narrowband filters are designed specifically for use with monochrome astronomy cameras. Because they block almost all light except for the very specific wavelengths of OIII, H-Alpha, and SII, they will not produce usable results on a standard color (OSC) camera.

Absolutely. Narrowband filters are one of the most effective tools for imaging from light-polluted locations. By only allowing light from specific emission lines to pass through, they effectively block out the majority of artificial light interference, allowing you to capture deep-sky objects even from your backyard.