Buy from Ebay: Lyx Lens
This 3.8mm lens is a direct replacement for most action cameras and drones/helicopters/quadcopters/UAVS, It adopts 8G + 1 IR filter lens structure and can reach upto 16MP high resolution, to most extent produce highly precise and quality picture, excellent correction of distortion.
Focal Length: 3.8mm
Black Vignetting: NO
Field of View (D*H*V) :95°*82°*65°
Back Focal Length (BFL): 5.59mm
Native Camera Sensor Support: 1/2.3"
Native Megapixel Support: 16MP
Thread Material: Metal
Optics Material: Glass
Installed Filter: Daylight (IR-Cut)
Works on Following Stock Cameras: Hero 4 Black & Silver, Hero 3+ Black & Silver, Hero 3 Black, Silver, RibCage Modified GoPro Hero 4/3+/3 Black