Though it's technically just a refresh of the company's prior fourth-generation waterproof case for the iPod nano, Capture ($80) has been redesigned not only to hold the fifth-generation nano, but to provide a usable clear spot on the back for the nano's camera, which can safely shoot video underwater at depths of up to 12 feet when locked inside. Packaged with an armband and belt clip, Capture provides full access to the nano's Click Wheel using…