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)
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