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Rear Lens Nd Filter Kit For Sigma 12-24mm F/4 Dg Hsm Art Lens Canon Ef Mount & Sigma 14-24mm F/2.8 Dg Hsm Art Canon Ef Mount - Camera Filters - AliExpress
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NiSi 150mm Q Filter Holder for Sigma 12-24mm f/4 Art Series (No vignetting at 90 degrees rotation) | NiSi Optics USA
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Aluminum 150mm Square Filter Holder Bracket Support For Sigma 12-24mm F/4.5-5.6 Ii Dg Hsm Compatible For Lee Hitech 150 Filter - Camera Filters - AliExpress
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