Besides removing the IR and UV ends of the spectrum which are often out of focus in refractive optics, the IDAS HEUIB-II filter isolates the common H-alpha line relative to the surrounding extreme red end of the spectrum, making it easy to bring out the faint H-alpha emission nebulosity of astronomical photos, yet retain the background color balance of broadband photos.
This filter connect in simple way in the camera body of the Canon EOS DSLRs with APS-C sensor (it comes with installation manual), just in front of the camera mirror. It's fixed in position by adding a Canon EOS T2 or M48 ring.