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It also helps to use focus limiting range selector on the lens.
I should have provided a little more detail. The reason I asked was because I really don't see well enough underwater (or above the water for that matter) to utilize manual focus well. I rely on autofocus. My camera fits snuggly in the housing, without the focus gear, and shows not sign of movement. If I don't need it, then I will just leave it off, and consider it one less piece of equipment to deal with.
I can home in on what I want the picture to be.