My all in one Magic Filter

Here is my all in one Magic Filter. I honestly do not know if this is something tried before as I have been out of shooting for so long. Heck it might even be banned it's that good. :-) I use this for Air Pistol shooting and it's great for moving from a dark range with paper targets to a bright range using electronic targets. Same lens no changing for different light levels. Let me know what you think. Educate me if it's a well known thing. #airpistols #airpistolfinals #shootingsports #issf #Feinwerkbau