The ikelite underwater housing with ttl is an underwater case for the canon powershot g16 digital compact camera not only is it waterproof down to 60m allowing the canon g16 to be used whilst snorkelling or diving but the ikelite housing is also lightweight and robust offering the canon powershot g16 plenty of protection on dry land the large mechanical controls are easily accessible and enable you to control all of the g16s functions except for the diopter adjustment dial for a system of