ZWO H-Alpha Narrowband Filter

The 7nm bandwidth is narrow enough to isolate the specific light emitted by hydrogen-alpha regions in nebulae while blocking most other wavelengths. This significantly increases contrast, allowing you to capture faint details even when shooting from light-polluted urban environments.

Yes, the filter features a standard 1.25-inch threaded housing designed to screw directly into most common filter wheels and eyepiece holders.

This filter is specifically optimized for long-exposure astrophotography. Because it is so narrow, it blocks too much light for the human eye to see anything through an eyepiece, making it unsuitable for visual use.

Yes, this filter is intended for use with monochrome astronomy cameras. If you use it with a color (OSC) camera, the Bayer matrix on the sensor will block most of the signal, resulting in very poor efficiency.

A 7nm bandwidth offers a great balance between high contrast and signal throughput. While 3nm filters provide even higher contrast by blocking more light pollution, they require longer exposure times and are more sensitive to the focal ratio of your telescope.