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Nikon 14-24mm F2.8 DIY filter holder (In progress): Nikon SLR Lens Talk Forum: Digital Photography Review
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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 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](https://ae01.alicdn.com/kf/HTB1GHRwQVXXXXaTaXXXq6xXFXXXd/Aluminum-150mm-Square-Filter-Holder-Bracket-Support-for-Sigma-12-24mm-f-4-5-5-6.jpg)