The GoPro HERO has a lot to offer, but one thing it lacks is a way to mount a filter. The Revo 52mm Filter Mount for GoPro HERO3+/HERO4 Standard Housing allows you to use standard 52mm filters over the lens port of the HERO3+ or HERO4 Standard Housing. This can be useful if you want to use an ND for shooting at slower shutter speeds, if you want a polarizer for more vivid daylight imagery, or to use a color correction filter underwater. Constructed from die cast aluminum, the adapter is secured in place by a small Philips head screw.
Note: The adapter is specifically for the HERO3+ and HERO4 Standard Housing; if you use the HERO3+ or HERO4 Dive Housing you will need AC-H3FM-58 instead.