Aurora Aperture Introduces Industry First Rear Mount Glass Filter for Canon EF 11-24mm F4L USM

Aurora Aperture Inc. , a Southern California startup, today has introduced the PowerND family of high quality fixed neutral density (ND) filters. The PowerND family consists of three ratings of light reduction capability: ND64 (6 stops),ND4000 (12 stops), and ND65000 (16 stops).