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Amazon.com : UV Filter for Sigma 50mm f/1.4 DG HSM - High Definition Ultra-Violet Filter (UV - 77mm) : Electronics
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Amazon.com : Bower 77mm UV Lens Filter for Sigma 50mm F1.4 DG HSM Lens, Sigma 28mm F1.8 EX Aspherical DG DF Lens, Sigma 24mm f/1.4 DG HSM Art Lens, Sigma 17-50mm f/2.8
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