For my first foray into narrowband imaging, I selected the ZWO Duo-Band Filter that is for use with color cameras and has transmission for the H-alpha and O-III lines. This seemed like a good choice since I live in a relatively light polluted area (Bortle class 5 skies), and I'm currently using a Canon 70D DSLR for the camera. Overall I'm happy with the filter except for the artifacts in the brightest stars (see attached). Any suggestions for how to eliminate these artifacts, either physically or using deconvolution? I've tried building up an artificial PSF but so far they have not had the spikey parts that I want to remove.