One day you are diving in murky waters and you need a tight beam to help cut through the murk. The next you are doing a night dive in crystal clear water and want to light up the ocean. Other days, you want to be somewhere in between. One of the most utterly epic characteristics of the Nanight Sport 2 and Tech 2, is you have the ability to use one light for all three of the aforementioned dives. Nanight gives you three different lenses to choose from, you can have a 10°, 35° and 55° light all in one. Changing from one lens to another can even be done between dives. All you have to do is unscrew the tube and swap one lens for the other, easy as that!