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Aurora Aperture unveils new rear mount filter system for Canon, Nikon, Sigma & Sony ultra wide-angle lenses: Digital Photography Review
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Haida Rear Lens ND Filter Kit for Sigma 14-24mm F/2.8 DG DN Art Lens for Sony E and Leica L, Includes ND0.9/1.2/1.8/3.0 Filter - 6242 | Gear Focus
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Open Box Haida Rear Lens Filter Kit for Sigma 14-24mm F2.8 DG HSM Art Lens for Canon EF and Sigma 12-24mm F4.0 DG HSM Art Lens for Canon EF
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