Flash triggers, not trigger fingers! What are they? What do they do? Why?

"Guide number," "beam angle," and "recycle time" are used to quantify light from strobes, but what do those numbers mean to the underwater photographer?

Want to get closer? Add a close-up lens. Want to get even closer? Add another close up lens. It sounds complicated, but Saga makes it easy !

We take the 11-24mm f/4L into the pool!