Huilianchuang 2.5mm Wide 170 Degree Replacement Sport Camera DV Lens for Camera Gopro Hero HD 1 2 Sjcam Sj4000 Compatible with GoPro Hero 1 and Hero 2 Sjcam Sj4000 camera Viewing angle (degree): 170; Focal distance (cm): 2.6; Aperture range: 2.8 Wide angle lens allows more of the scene to be included in the photograph Able to emphasis the difference in size or distance between objects in the foreground and the background: nearby objects appear very large and objects at a moderate distance appear small and far away Package includes:1 X Wide Angle Lens