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Amazon.com : Haida HD4643 6972288553254 Rear Lens ND Filter Kit (ND0.9+1.2+ 1.8+3.0) for Sigma 14mm f/1.8 DG HSM Art, Canon EF, Colorless : Electronics
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Sigma can install a rear-mounted filter holder on your Canon 14mm F1.8 Art lens: Digital Photography Review
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