Neewer Aluminum Alloy Matte Box with Donut Ring,Fit 15mm Rail Rod Rig,for Nikon Canon Sony Fujifilm Olympus DSLR Camera Camcorder DV/HDV/Broadcast Video Movie Film Making System A helpful tool in light control! Matte box made of aluminum alloy, specially designed for DSLR camera.Suitable for filming indoor or outdoor. Dressed in special paint,the flags are endowed with strong matting effect to minimize unwanted light in your lens. With screw knobs on side of matte box,the detachable flags can be easily secured in place in case of accidental fall off. Height adjustment feature to be compatible with rigs of different height. Four donut rings(65mm,70mm,75mm,85mm)for lens of different diameter. Build with industrial standard,fits 15mm Rods with center-to-center 60mm distance.