The MBF-5PA Expandable Top Matte Box Flap from Cavision provides additional flare protection for the MB4169H and MB4510H series matte boxes. Easily mounted and adjusted, this flap has expandable sides and fine-tunable positioning. It can also be used to protect your lens front when not shooting.
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Broke on the first day, the product is completely useless. The need to adjust the tension with an allen wrench (supplied) makes it usless on set as it flops in front of the lens. The expanding wings are so flimsy that the edges broke off as I was adjusting them.