As I continue to research and fret over my desire to upgrade my underwater photography equipment, I have come upon a couple of articles and posts that raised an issue that I don't see mentioned very often. It goes like something like this: Using a DSLR for underwater photography changes the experience from taking photos while diving to one of diving to take photos.
In other words, the suggestion is that someone who does not want to expend significant time and energy on pre-dive inspection and preparation and post dive maintenance is probably better off with a P&S because the care and feeding of the DSLR being significantly greater than a P&S. It has been suggested that this has to do with the number of o-rings, ports, cables, arms, etc that one has to carry and maintain and the amount of space required to pack all of this stuff. Perhaps if one uses only one port and lens and one strobe this is not an issue? I know I have read comments about pre-dive camera setup checklists and that some DSLR people spend significant time readying their gear for a dive, while I probably spend 5 minutes checking settings and making a quick check of the o-ring. I also note that I have seen some extensive discussions about rinse tanks. Franky, with my P&S, if there isn't a rinse tank handy (and there often isn't) I pour a small bottle of water over the camera housing before putting it away for a better rinse later.
I suppose the P&S / DSLR maintenance difference could go further. On the dive boats that I am on most often, there is no camera table or even a reliably dry or clean area in which one could safely change lenses or replace memory cards and batteries. Those activities often have to wait until after the the dive day. Similarly, I dive one location where one has to climb down about a 10' ladder to enter the water. As I think about it, I don't know how a diver could descend the ladder without clipping the camera to a BC. Is this even feasible with a large DSLR?
Additionally, the argument is that a typical DSLR user doesn't take the camera on a dive, swimming around and taking a few shots of something of interest and then moving on, rather he is likely going to find a subject and experiment with flash settings, strobe placement, positioning, and may spend much or all of a dive and dozens of images of that subject.
The last the argument is that lugging around a large and somewhat cumbersome DSLR setup alters the diving experience sufficiently that it really becomes a photo session underwater, rather than a dive on which you have brought a camera. Does the DSLR have a significant effect on how one dives, including air consumption, buoyancy, trim, and so on? I know I have read threads about which fins are best to propel a diver with a DSLR in their hands.
What do you think? On land this isn't necessarily true. Using a DSLR or point & Shoot is different, but the preparation, use and care after use is not really different. For example, one might take a body and 2-3 lenses in a camera bag to some sort of event or location, but the next day want to take a camera to a family gathering to grab a few shots of the family. Using the DSLR is not substantially different from a weight or bulk standpoint.
To put this in context, I am fairly sure that no matter what gear I have, my main focus on most dives will continue to be enjoyment of the dive. I certainly am happy to spend several minutes trying to get a nice shot of some interesting subject, but I'm talking about maybe a couple to 10 minutes or so shooting several shots of something before moving on, and a lot of photographs are quick fish portraits or an interesting crab or worm or coral head as I pass by.
How much does the "type" of photography dictate gear? This actually reminds me of the large & medium format vs. 35mm debates. The large and medium format cameras traditionally did well when used on tripods for landscapes and static subjects, but the 35mm became the preferred choice for "street" photography, casual portraiture, sports, etc. Maybe type of use even influences the live view vs. viewfinder discussions I have read.
On the other hand, maybe it is silliness. I certainly don't have the experience to say. I just thought it was an interesting issue, and one that my influence a future buying decision.