3.37mm f/2.8 87d HFOV 16MP for Gopro Hero 4 (Flat) from 4K LENS is a amazing wide angle lens with no ‘fisheye’ distortion. This lens is light weight at 5g and super sharp with 16MP optics. Special optics make this lens ‘rectilinear’ so there is no fisheye distortion at all. Excellent edge to edge sharpness. Perfect for drone and gimbal use and great for general shooting.