Any doubts we had about taking our precious iPhone underwater we soon swept aside when we tried out the LenzO housing. It is tough, well made, has good closing mechanisms with a reassuring clunk as the port and back secure into place. You do not need a special app to get the camera to work. It has excellent optics and the controls mean that you can access both the different modes of the camera (slo-mo, panoramic, video etc) and the exposure controls with ease. You can review your images with the swipe feature, as well as read an iBook on your safety stop. It has a special "selfie" lens too!
Best bit? You can post your images and video onto social media just minutes after getting out of your wetsuit (or drysuit). For more about this, have a look at our review on Scubaverse by clicking here