Eagle Ray's point of Back Button Focus is spot on for macro and super-macro shooting. I've shot D70, D90 and currently D7000. On the back of your D200, there is an AF-ON button. Use this to achieve the back button focus and eliminate the focus lock with the shutter. I use it for all my shots, except that on my D7000, I have to program the AF-L button to AF-ON. You don't have to do that. AF is so good these days that I don't know any pros who are using manual focus UW. But I'm sure there are a few.
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