Coloured filters are a commonly suggested solution for the blue or green colour tinge that pictures taken underwater using available light can have. But these filters have their limitations, are not always necessary and can be a double edged sword when shooting pictures or video underwater.
When starting out taking a camera underwater, you are adding an additional task load to your diving. Because of this setting the camera to Auto and just taking snaps to start off with isn't necessarily a bad thing. But what you'll find is that often your pictures won't look as good as you'd like them to.
In part two of my musings I mentioned using a snoot to manipulate strobe lighting while taking underwater macro shots. In this blog I'm going to cover them in some detail.