Authentic ..... there are a lot of non authentic versions of these filters around, instantly recognisable when they are in your hands because of the rainbow like refractions on the glass, this one is REAL. Faint signs of normal use only, No scratches or fungus or haze etc absolutely nothing that will effect an image, nice. AUTHENTIC HOYA 77mm PRO 1  DIGITAL DMC LPF UV FILTER. Free UK P&P.