Entaniya Fisheye Lens is designated for cameras with mount size of M12/P0.5 and sensor size of 1/2.3-1/1.7.
Action cameras like GoPro HERO4 and HERO3 have a sensor size of 1/2.3 and lens mount of M12/P0.5 so attaching Entaniya Fisheye is possible. (Modification required)
Contact: Eileen Luo
Add: 4th 313 Room,Liling E-commerce Industrial Park ,Hunan Province, China