The correct use of light is key to great photography. In later lessons, we’ll take a look at why you (usually, but not always)add artificial lighting when diving below about 10 feet/3 m. For now, let’s take a look at the actual means of adding light to underwater stills and that is through flash-guns that are more usually referred to as strobes.
There is no one strobe that works best for all the different types of underwater shooting. One type may work best with wide-angle and the other with macro and so on. It is vital to understand all the functionality of the strobes you own and how to get the very best out of them that you can. We are often surprised by the number of people who shoot their strobes continuously at full power with no regard for what the effect is on their photos underwater.