Underwater advice
Hey, I'm planning on learning to SCUBA in the not-that-distant future, and naturally I will need a camera to function in aquatic environments. A Google search lead me to the Nikonos series of cameras, and I'm thinking about getting a Nikonos V and loading it with some sort of Fujichrome.
Those of you who have experience with these things, are there important things to know about quirks in the camera's design, suggested setups, or am I wasting my time and should be looking at something else?
The Nikonos line are great cameras. The Nikonos V, with a Nikonos 15mm lens, and 15mm viewfinder attachment (the Nikonos V is a range finder camera), and a u/w strobe is an excellent set up. There are a few things to be aware of with the Nikonos cameras. One is that it is possible to twist off the lens underwater which will totally flood the camera. So you want to be careful not to let the camera get bumped around or be grabbed by the lens. They are also nice for beginning divers because they are small and you can lanyard it to your wrist leaving your hands free.
That being said you can probably pick up a relatively inexpensive housing for several different cameras, some of which are very compact. I have two Nikonos III's (earlier version of the V) that I use free diving but I often use my Nikon N90 in an Aquatica housing with a Nikon 20mm lens, and a strobe. There are several different lenses that can be used with the housing and only require different port extensions to allow proper focusing (unless you want to shoot macro then there is a flat port option). I recommend using a housing made of aluminum. Manufactures such as Aqautica, Sea and Sea, SeaCam, and Subal all make/made quality housings from aluminum.
Whatever you use you will want light, ie a strobe (or two). Natural light gets filtered very quickly by water. Within the first 15ft most of the red spectrum is gone and you will need an artificial light source to bring back the "natural" color of things. You brain does a pretty good job of compensating for the loss of the red part of the spectrum so without additional light your images will not look as you see them.
Above all being a good diver will allow you to be a better underwater photographer. I hesitate to recommend when you should start bringing a camera during your dives. Some people are very comfortable and good in the water and can begin shooting right away while others may need to get a few more dives under their belt first. It is all dependent on your skills.
I hope this helps. If you have any other questions, ask away.
Cheers
Matt