ZWO H-Alpha CCD Filter

A 7nm bandwidth is narrow enough to isolate the specific light emitted by hydrogen atoms while blocking most other wavelengths. This significantly increases the contrast of nebulae and allows you to capture high-detail images even when shooting from light-polluted areas.

This filter features a standard M48x0.75 male thread, which is compatible with most 2-inch filter wheels, filter drawers, and eyepiece holders. Ensure your specific camera or imaging train supports 2-inch threaded accessories before purchasing.

While it is technically possible to use this for visual observation, it is designed primarily for astrophotography. Because the filter is so narrow, the image will appear very dim to the human eye, making it difficult to see anything other than the brightest emission nebulae.

The filter includes a built-in infrared cut-off that blocks wavelengths between 700nm and 1100nm. This prevents infrared light from reaching your sensor, which helps maintain sharp focus and prevents bloated stars in your final images.

You can use this filter on its own to create monochrome H-Alpha images, which are excellent for highlighting structural details in nebulae. If you want to create a full-color image, you would typically combine this data with images taken through Oxygen-III and Sulfur-II filters to create a 'Hubble Palette' or SHO image.