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FOTGA DP500III DSLR Swing away Matte Box+ND1000 4X4" Glass Filter for 15mm Rod Rig|matte box|4x4 matte boxdslr matte box - AliExpress
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SmallRig Filter Tray (4 x 4) for SmallRig Mini Matte Box, Compatible with 4 x 4 Plug-in Filters - 3320 : Electronics - Amazon.com
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Amazon.com : Fotga Square 4x4 inch Optical Glass Full Neutral Density Filter, ND2 Full ND Filters for Swing Away Matte Box Holder (ND2) : Electronics
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