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NiSi Sigma 12-24mm f/4 HSM ART Series Adapter for NiSi 180mm Filter Holder (Discontinued) | NiSi Optics USA
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Amazon.com : Hakuba Haida HD4332 Square Filter System for M15 Series, Adapter Ring for Sigma 0.5-0.9 inches (12-24 mm), F4.0 DG HSM Art Lens Exclusive : Electronics
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