I'm seeing this artifact on bright stars using a DSLR (T3i full spectrum mod), Hutech IDAS HEUIB-II in-camera filter, and a Bower (=Samyang) 135mm F/2 lens. I really like the lens - very flat field and no CA, even when used wide open. But I'd like to know if this artifact is the lens or the filter or what? Note that the black wedges are at different orientations in different positions on the picture. Anyone see this before?