Camera Lens Protection for Hero 4, Hero 5, Session (YXJBAE5YM) by BrainExploder
GoPro Hero 4: Everything You Need to Know
Amazon.com : CamKix Diving Lens Filter Kit Compatible with GoPro Hero 4, Hero+, Hero and 3+ - fits Standard Waterproof Housing - Enhances Colors for Underwater Video and Photography - Includes 5 Filters : Electronics
GOPRO 2, 3 and 4 lens 4K 1/2.3” 12MM, M12 X 0.50 - Hajimoto Productions LLC
GoPro HERO4 Black/Music | Sweetwater
GOPRO HERO4 BLACK CAMERA 7.2MM RECTILINEAR FLAT LENS+PROFILE MOD NO PINK EDGES | eBay