When capturing professional-grade photography or videography, the Zip Box Pro 4x5.65" Clamp-On Matte Box is an essential tool for 87mm diameter lenses. This compact and lightweight matte box is designed to securely hold up to three 4x5.65 filters, which can be conveniently loaded from the front and held in place by a spring-loaded latch. The Zip Box Pro 4x5.65" Matte Box is equipped with a top flag, crafted from lightweight carbon fiber, providing optimal protection for your lens between takes. This protective flag can be easily removed by loosening the top thumbscrew, aligning the tab with the key slot, and pulling out, making it a versatile addition to your photography equipment. The rear opening of this matte box offers flexibility, as it can be swapped out by loosening the four thumbscrews and replacing with clamp-on backs featuring diameters of 114mm, 110mm, 104mm, 100mm, 95mm, 87mm, and 80mm. This feature allows for seamless compatibility with a variety of lens sizes..