Designed for the GoPro Hero3 and Hero3+ Black, the Ribcage is available to pre-order either as a DIY kit for $199, or as a pre-installed version for $799. Once in place, you can load on any C-Mount lens, which brings the advantages of aperture and depth of field control, manual focus, and zooming. Not only that, but the modification includes a removable IR filter, so that you can do infrared photography if you desire.
LINK (via:Pop Photo)