Alpine Astronomical Baader Astrophotography H-alpha Conversion Filter for Canon Rebel XT/10D/20D/30D

The Alpine Astronomical Baader Astrophotography H-alpha Conversion Filter replaces your Canon Rebel XT, 10D, 20D, or 30D camera's cover glass to convert it into a dedicated astrophotography imager. Replacing the stock cover glass with this filter allows the sensor to gain full resolution and efficiency of the H-alpha wavelength, while maintaining the correct factory focal point to ensure sharp and crisp images. Anti-reflection coatings are designed to prevent halos and are layered uniformly to prevent physical deformation of the optically flat substrates.