Gave my old Hero 4 ND adapter a new life!
was just sitting there in my camera bag and figured I'd give it a try, no vignetting and the filter doesn't crash into the gp mount flange, could probably squirt some black rtv silicone around the base of the filter adapter to regain some waterproofing but it doesn't get used around water and it lives with the battery door off for charging/power while filming. I had already modified it to use with my Hero 4black so besides grinding down the backside of the adapter I'm not sure if any more modifications are needed with a brand new one, going to grind down the outer edges of the gpmount flange so it sits a little deeper into the ND adapter giving the screws a little more bite, right now the only screws holding it on are the 3 screws just around the lens flange. Will it overheat?? 😬😬