Back-Bone Rib Cage modified 3+
This is my modified GoPro 3+ fitted with a C mount 8-50mm zoom lens with manual iris. The lens is cheap, and designed for surveillance cameras, despite this it produces pretty decent results, however it is a pig to focus almost 3K images on the bacpac screen - so I intend to fit a 3.6 mm distortion free wide angle lens to this one, set the flange back and I'm good to go.
Ripping the GoPro to bits and rebuilding is not for the faint hearted, but Back-Bone produce videos and a comprehensive pdf to help you along.
Bokeh samples from this rig here: https://www.youtube.com/watch?v=fLW5WHTAgT8&feature=youtu.be