Astronomik H-Alpha CCD Filter

The 6nm bandwidth is narrow enough to isolate the specific hydrogen-alpha emission line while effectively blocking out light pollution and moonlight. This results in significantly higher contrast, allowing you to capture faint nebulae details even from light-polluted urban skies.

This filter is designed with a standard 1.25-inch screw-in mount, making it compatible with most standard telescope eyepieces and filter wheels. Please verify that your specific camera or filter wheel accepts 1.25-inch threaded filters before purchasing.

This filter is specifically optimized for CCD and CMOS astrophotography. While you could technically look through it, the 6nm bandpass is extremely narrow, meaning it will appear almost entirely black to the human eye, making it unsuitable for visual observation.

Astronomik uses high-quality optical glass designed to withstand the rigors of frequent use without degrading. The filter is backed by a 10-year warranty, which is significantly longer than the industry standard, reflecting the manufacturer's confidence in the coating and glass longevity.

Yes, because this filter blocks a large portion of the visible light spectrum, you will need to significantly increase your exposure times compared to shooting without a filter. It is best used with a tracking mount to accommodate the longer exposures required for deep-sky imaging.