Great underwater filter for a Hero 3. Tweaks the auto white balance nicely to re-introduce colours lost in sea water. Clips simply to housing- watch for trapped bubbles. A little brittle, but at this price order some spares!!
Hugely disappointing release, missing expected special features (Joss Whedon commentary in particular) and it has now emerged that a scene for an important plot point has been tampered with. The film is brilliant, just don't buy it in the UK.
Never has a case been made so clearly in favour of digital piracy.