Mattbox for gopro 3/4. Designed for narrow view. If you have a 3d printer file is at GoPro Mattbox by L5MEDIA
Thanks- that's what I thought but didn't think the bottom fin would help much.In still photography and video, a matte box is a device used on the end of a lens to block the sun or other light source in order to prevent glare and lens flare. It performs essentially the same function as a lens hood and also mounts in front of the lens, but usually includes adjustable fins calledFrench flags.
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