2" polarisation filters, individually with 2" filter version

2" polarising filter with a 48 mm filter thread for stepless brightness adjustment with the Baader Herschel prism: as the light is partially polarised at the reflective surface of the Herschel prism, it can be easily and steplessly attenuated using a polarising filter fitted downstream. In this way, the brightness can be adjusted depending on the lighting conditions (weather) or the telescope being used. To do this, simply screw the polarising filter into the 2" barrel of the eyepiece. By turning the eyepiece slightly, the filter then adjusts the brightness.