2" polarisation filters, individually with 2" filter version

2" polarising filter with 48mm filter thread for stepless brightness adjustment with the Baader Herschel prism: As the light is partially polarised at the reflecting surface of the Herschel prism, it can be easily and steplessly attenuated with a downstream polarising filter. In this way, the brightness can be adjusted depending on the light situation (weather) or the telescope used. All you have to do is screw the polarisation filter into the 2" receptacle of the eyepiece. By turning the eyepiece slightly, the Filter then changes the brightness.