SmallRig Side Flag 3597 is an accessory for Matte Box (ID: 3196, 3575, 3680). The top flag opens 180° and its side wings extend 40° for additional light blocking. The side flag is attached to either the matte box or the filter tray via slots, allowing for free and flexible assembly. It opens 135°, which provides all-round protection against glare and flare, thus facilitating better images presentation on the screen.