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If I win a snap on filter for my beloved GoPro Hero HD 2, i'd wait for a nicely sunny but chill day in winter, with probably some snow around and jump into Lake Neufeld near Vienna NAKED!!! And film that with my GoPro and the new snap on filter on it! Pinky promise!
And btw: if you plan on producing a polarizing filter, i'd take this one too, and slide down a ski slope on Dachstein glacier on my bare backside... and film this with my Go Pro too... :-D