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4×5.65 Carbon Fiber Matte Box (Clamp-on) | Tilta
ARRI MB-28 - 3 Stage 6x6 Studio Matte Box
ARRI Demonstrates the Modularity of the Lightweight Matte Box 4x5 at Cine Gear 2018 - YouTube
LanParte Matte Box Lens Clamp Adapter 114mm for Arri Master Premium Lens and Cine Camera DSLR Camera Accessories|Photo Studio Accessories| - AliExpress