IceBone
Blue Wheel Hipster
Viper007Bond: *shrug* You still get the ultra wide angle, this is just the lens on the casing, which is not really a lens in terms of magnification. The deal with refraction indexes is such that unless you have a perfectly flat translucent material, though, the nodal point will be elsewhere and the image will be out of focus. Normal underwater casings can get away with that, because they're made for cameras which can change their focus, the GoPro is fixed.
Avanti: Should be fine, provided you have a high quality enough device for recording. The GoPro itself has no external mic input.
Avanti: Should be fine, provided you have a high quality enough device for recording. The GoPro itself has no external mic input.