The Nikonos is a bugger to use - manual everything, and you have to make guesstimate corrections for focus distances. By the time you've thought it all through and pressed the shutter, you're lucky if the shot's correctly exposed and / or in focus, and indeed if your subject hung around long enough for you to stop messing about. I wouldn't think twice about it - digital is the only way to go underwater, IMHO.
Peter
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Hmmmm, I looked in here because I am interested in the housed G-9, but, sorry Peter, I have to strongly disagree with you re. the Nikonos. I have two V's and a IV. With the 15 mm lens, the Nikonos 5 handles like a P&S, except much better pix (a lot of pros who switched to digital still use the 15mm Nikonos for wide angle. It has such a wide depth of field it's almost impossible to get out-of-focus shots with just a bit of care. Auto mode works very well for 75% of the shots, and if you are looking for certain effects eg, sunburst in top of pic, you just pre-adjust, which you would have to do with any camera, even the most sophisticated housed dslr.
I scan my slides, put them on the computer, and then process them if I need to. I'm thinking of switching to digital because I'd like more flexibility underwater, and I'd like to see if I got the shot I wanted while I still have a chance to redo it, and I don't like running out of film when THE shot of the dive appears. Also, I've gotten some wonderful macro shots with the tubes and framing wires. BUT, critters don't like the wires in their faces, and when I have that set up, I'm stuck with macro for the whole dive.
But, again, Peter, WRONG, WRONG, WRONG about your percetions of the Nikonos.
Jim